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python2.7 2.7.18-8
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+++++++++++
Python News
+++++++++++

What's New in Python 2.7.18 final?
==================================

*Release date: 2020-04-19*

There were no new changes in version 2.7.18.



What's New in Python 2.7.18 release candidate 1?
================================================

*Release date: 2020-04-04*

Security
--------

- bpo-38945: Newline characters have been escaped when performing uu
  encoding to prevent them from overflowing into to content section of the
  encoded file. This prevents malicious or accidental modification of data
  during the decoding process.

- bpo-38804: Fixes a ReDoS vulnerability in :mod:`http.cookiejar`. Patch by
  Ben Caller.

Core and Builtins
-----------------

- bpo-38535: Fixed line numbers and column offsets for AST nodes for calls
  without arguments in decorators.

Library
-------

- bpo-38576: Disallow control characters in hostnames in http.client,
  addressing CVE-2019-18348. Such potentially malicious header injection
  URLs now cause a InvalidURL to be raised.

- bpo-27973: Fix urllib.urlretrieve failing on subsequent ftp transfers from
  the same host.

Build
-----

- bpo-38730: Fix problems identified by GCC's ``-Wstringop-truncation``
  warning.

Windows
-------

- bpo-37025: ``AddRefActCtx()`` was needlessly being checked for failure in
  ``PC/dl_nt.c``.

macOS
-----

- bpo-38295: Prevent failure of test_relative_path in test_py_compile on
  macOS Catalina.

C API
-----

- bpo-38540: Fixed possible leak in :c:func:`PyArg_Parse` and similar
  functions for format units ``"es#"`` and ``"et#"`` when the macro
  :c:macro:`PY_SSIZE_T_CLEAN` is not defined.


What's New in Python 2.7.17 final?
==================================

*Release date: 2019-10-19*

There were no new changes in version 2.7.17.



What's New in Python 2.7.17 release candidate 1?
================================================

*Release date: 2019-10-07*

Security
--------

- bpo-38243: Escape the server title of
  :class:`DocXMLRPCServer.DocXMLRPCServer` when rendering the document page
  as HTML. (Contributed by Dong-hee Na in :issue:`38243`.)

- bpo-38174: Update vendorized expat library version to 2.2.8, which
  resolves CVE-2019-15903.

- bpo-34631: Updated OpenSSL to 1.0.2s in Windows installer

- bpo-35647: Don't set cookie for a request when the request path is a
  prefix match of the cookie's path attribute but doesn't end with "/".
  Patch by Karthikeyan Singaravelan.

- bpo-35121: Don't send cookies of domain A without Domain attribute to
  domain B when domain A is a suffix match of domain B while using a
  cookiejar with :class:`cookielib.DefaultCookiePolicy` policy. Patch by
  Karthikeyan Singaravelan.

- bpo-34155: Fix parsing of invalid email addresses with more than one ``@``
  (e.g. a@b@c.com.) to not return the part before 2nd ``@`` as valid email
  address. Patch by maxking & jpic.

- bpo-36742: Fixes mishandling of pre-normalization characters in
  urlsplit().

- bpo-30458: Address CVE-2019-9740 by disallowing URL paths with embedded
  whitespace or control characters through into the underlying http client
  request.  Such potentially malicious header injection URLs now cause an
  httplib.InvalidURL exception to be raised.

- bpo-36216: Changes urlsplit() to raise ValueError when the URL contains
  characters that decompose under IDNA encoding (NFKC-normalization) into
  characters that affect how the URL is parsed.

- bpo-35907: CVE-2019-9948: Avoid file reading by disallowing
  ``local-file://`` and ``local_file://`` URL schemes in
  :func:`urllib.urlopen`, :meth:`urllib.URLopener.open` and
  :meth:`urllib.URLopener.retrieve`.

Core and Builtins
-----------------

- bpo-38106: Fix race in PyThread_release_lock that was leading to memory
  corruption and deadlocks. The fix applies to POSIX systems where Python
  locks are implemented with mutex and condition variable because POSIX
  semaphores are either not provided, or are known to be broken. One
  particular example of such system is macOS.

- bpo-37329: valgrind: suppress a false alarm in memory leak checks.
  _PyWarnings_Init() only allocates memory once at startup but it is not
  released at exit. Ignore this issue to be able to catch other bugs more
  easily.

- bpo-26423: Fix possible overflow in ``wrap_lenfunc()`` when ``sizeof(long)
  < sizeof(Py_ssize_t)`` (e.g., 64-bit Windows).

- bpo-27987: pymalloc returns memory blocks aligned by 16 bytes, instead of
  8 bytes, on 64-bit platforms to conform x86-64 ABI. Recent compilers
  assume this alignment more often. Patch by Inada Naoki.

- bpo-36504: Fix signed integer overflow in _ctypes.c's
  ``PyCArrayType_new()``.

- bpo-36459: Fix a possible double ``PyMem_FREE()`` due to tokenizer.c's
  ``tok_nextc()``.

- bpo-36430: Fix a possible reference leak in :func:`itertools.count`.

- bpo-18368: PyOS_StdioReadline() no longer leaks memory when realloc()
  fails.

- bpo-36262: Fix an unlikely memory leak on conversion from string to float
  in the function ``_Py_dg_strtod()`` used by ``float(str)``,
  ``complex(str)``, :func:`pickle.load`, :func:`marshal.load`, etc.

- bpo-36149: Fix use of uninitialized memory in cPickle when reading a
  truncated pickle from a file object.

- bpo-33006: Clarified Doc string for builtin filter function. 2nd Argument
  can be any iterable. Patch by Tony Flury

Library
-------

- bpo-38216: Allow the rare code that wants to send invalid http requests
  from the `http.client` library a way to do so.  The fixes for bpo-30458
  led to breakage for some projects that were relying on this ability to
  test their own behavior in the face of bad requests.

- bpo-38175: Fix a memory leak in comparison of :class:`sqlite3.Row`
  objects.

- bpo-33936: _hashlib no longer calls obsolete OpenSSL initialization
  function with OpenSSL 1.1.0+.

- bpo-34410: Fixed a crash in the :func:`tee` iterator when re-enter it.
  RuntimeError is now raised in this case.

- bpo-37965: Fix C compiler warning caused by
  distutils.ccompiler.CCompiler.has_function.

- bpo-34521: Fix file descriptors transfer in multiprocessing on FreeBSD:
  use ``CMSG_SPACE()`` rather than ``CMSG_LEN()``; see :rfc:`3542`.

- bpo-37664: Update wheels bundled with ensurepip (pip 19.2.3 and setuptools
  41.2.0)

- bpo-37437: Update vendorized expat version to 2.2.7.

- bpo-36742: :func:`urlparse.urlsplit` error message for invalid ``netloc``
  according to NFKC normalization is now a :class:`str` string, rather than
  a :class:`unicode` string, to prevent error when displaying the error.

- bpo-12639: :meth:`msilib.Directory.start_component()` no longer fails if
  *keyfile* is not ``None``.

- bpo-36713: Rename the :meth:`test_ascii_replace` to
  :meth:`test_ascii_strict`.

- bpo-28552: Fix :mod:`distutils.sysconfig` if :data:`sys.executable` is
  ``None`` or an empty string: use :func:`os.getcwd` to initialize
  ``project_base``.  Fix also the distutils build command: don't use
  :data:`sys.executable` if it is ``None`` or an empty string.

- bpo-36337: Fix buffer overflow in :meth:`~socket.socket.send` and
  :meth:`~socket.socket.sendall` methods of :func:`socket.socket` for data
  larger than 2 GiB.

- bpo-36291: Fix a possible reference leak in the json module.

- bpo-36289: Fix a possible reference leak in the io module.

- bpo-36212: Fix two possible reference leaks in the hotshot module.

- bpo-36235: Fix ``CFLAGS`` in ``customize_compiler()`` of
  ``distutils.sysconfig``: when the ``CFLAGS`` environment variable is
  defined, don't override ``CFLAGS`` variable with the ``OPT`` variable
  anymore. Initial patch written by David Malcolm.

- bpo-35807: Update ensurepip to install pip 19.0.3 and setuptools 40.8.0.

- bpo-36186: Fix linuxaudiodev.linux_audio_device() error handling: close
  the internal file descriptor if it fails to open the device.

- bpo-13096: Fix memory leak in ctypes POINTER handling of large values.

- bpo-36179: Fix two unlikely reference leaks in _hashopenssl. The leaks
  only occur in out-of-memory cases.

- bpo-36106: Resolve potential name clash with libm's sinpi(). Patch by
  Dmitrii Pasechnik.

- bpo-31292: Fix ``setup.py check --restructuredtext`` for files containing
  ``include`` directives.

Documentation
-------------

- bpo-37487: Fix PyList_GetItem index description to include 0.

- bpo-37149: Replace the dead link to the Tkinter 8.5 reference by John
  Shipman, New Mexico Tech, with a link to the archive.org copy.

- bpo-35126: Improve the examples in the "How do I convert a number to
  string?" question of the "Programming" section of the FAQ.  Contributed by
  Stéphane Wirtel.

- bpo-35605: Fix documentation build for sphinx<1.6.  Patch by Anthony
  Sottile.

- bpo-35564: Explicitly set master_doc variable in conf.py for compliance
  with Sphinx 2.0

- bpo-33832: Add glossary entry for 'magic method'.

Tests
-----

- bpo-37411: Fix test_wsgiref.testEnviron() to no longer depend on the
  environment variables (don't fail if "X" variable is set).

- bpo-37359: Add --cleanup option to python3 -m test to remove
  ``test_python_*`` directories of previous failed jobs. Add "make
  cleantest" to run ``python3 -m test --cleanup``.

- bpo-37362: test_gdb no longer fails if it gets an "unexpected" message on
  stderr: it now ignores stderr. The purpose of test_gdb is to test that
  python-gdb.py commands work as expected, not to test gdb.

- bpo-36816: Update Lib/test/selfsigned_pythontestdotnet.pem to match
  self-signed.pythontest.net's new TLS certificate.

- bpo-35925: Skip specific nntplib and ssl networking tests when they would
  otherwise fail due to a modern OS or distro with a default OpenSSL policy
  of rejecting connections to servers with weak certificates or disabling
  TLS below TLSv1.2.

- bpo-36560: Fix reference leak hunting in regrtest: compute also deltas (of
  reference count and file descriptor count) during warmup, to ensure that
  everything is initialized before starting to hunt reference leaks.

- bpo-36234: test_posix.PosixUidGidTests: add tests for invalid uid/gid type
  (str). Patch written by David Malcolm.

- bpo-36019: Add test.support.TEST_HTTP_URL and replace references of
  http://www.example.com by this new constant. Contributed by Stéphane
  Wirtel.

- bpo-27313: Avoid test_ttk_guionly ComboboxTest failure with macOS Cocoa
  Tk.

- bpo-26386: Re-enable missing widget testcases in test_ttk_guionly.

- bpo-34836: Fix ``test_default_ecdh_curve`` when TLSv1.3 is enabled by
  default.

Build
-----

- bpo-38301: In Solaris family, we must be sure to use ``-D_REENTRANT``.
  Patch by Jesús Cea Avión.

- bpo-14353: Fix detection of the bind_textdomain_codeset function for
  building gettext support into the locale module.

- bpo-36605: ``make tags`` and ``make TAGS`` now also parse
  ``Modules/_io/*.c`` and ``Modules/_io/*.h``.

- bpo-35264: Fix SSL module build with OpenSSL 1.1.0

Windows
-------

- bpo-38117: Updates bundled OpenSSL to 1.0.2t

- bpo-37445: Include the ``FORMAT_MESSAGE_IGNORE_INSERTS`` flag in
  ``FormatMessageW()`` calls.

- bpo-35360: Update Windows builds to use SQLite 3.28.0.

- bpo-1104: Correctly handle string length in
  ``msilib.SummaryInfo.GetProperty()`` to prevent it from truncating the
  last character.

macOS
-----

- bpo-38117: Updated OpenSSL to 1.0.2t in macOS installer for 2.7.x.

- bpo-19960: When building 2.7 on macOS without system header files
  installed in ``/usr/include``, a few extension modules dependent on
  system-supplied third-party libraries were not being built, most notably
  zlib.

- bpo-35360: Update macOS installer to use SQLite 3.28.0.

- bpo-34631: Updated OpenSSL to 1.0.2s in macOS installer.

- bpo-36231: Support building Python on macOS without /usr/include
  installed. As of macOS 10.14, system header files are only available
  within an SDK provided by either the Command Line Tools or the Xcode app.

IDLE
----

- bpo-37177: Properly 'attach' search dialogs to their main window so that
  they behave like other dialogs and do not get hidden behind their main
  window.

- bpo-13102: When saving a file, call os.fsync() so bits are flushed to e.g.
  USB drive.

Tools/Demos
-----------

- bpo-37675: 2to3 now works when run from a zipped standard library.

- bpo-14546: Fix the argument handling in Tools/scripts/lll.py.

C API
-----

- bpo-37170: Fix the cast on error in
  :c:func:`PyLong_AsUnsignedLongLongMask()`.


What's New in Python 2.7.16 final?
==================================

*Release date: 2019-03-02*

IDLE
----

- bpo-32129: Avoid blurry IDLE application icon on macOS with Tk 8.6. Patch
  by Kevin Walzer.


What's New in Python 2.7.16 release candidate 1?
================================================

*Release date: 2019-02-16*

Security
--------

- bpo-35746: [CVE-2019-5010] Fix a NULL pointer deref in ssl module. The
  cert parser did not handle CRL distribution points with empty DP or URI
  correctly. A malicious or buggy certificate can result into segfault.
  Vulnerability (TALOS-2018-0758) reported by Colin Read and Nicolas Edet of
  Cisco.

- bpo-16039: CVE-2013-1752: Change use of ``readline()`` in
  :class:`imaplib.IMAP4_SSL` to limit line length.

- bpo-28043: SSLContext has improved default settings: OP_NO_SSLv2,
  OP_NO_SSLv3, OP_NO_COMPRESSION, OP_CIPHER_SERVER_PREFERENCE,
  OP_SINGLE_DH_USE, OP_SINGLE_ECDH_USE and HIGH ciphers without MD5.

- bpo-34791: The xml.sax and xml.dom.domreg no longer use environment
  variables to override parser implementations when
  sys.flags.ignore_environment is set by -E or -I arguments.

- bpo-34623: CVE-2018-14647: The C accelerated _elementtree module now
  initializes hash randomization salt from _Py_HashSecret instead of
  libexpat's default CSPRNG.

- bpo-34540: When ``shutil.make_archive`` falls back to the external ``zip``
  problem, it uses :mod:`subprocess` to invoke it rather than
  :mod:`distutils.spawn`. This closes a possible shell injection vector.

- bpo-34405: Updated to OpenSSL 1.0.2p for Windows builds.

Core and Builtins
-----------------

- bpo-35552: Format character ``%s`` in :c:func:`PyString_FromFormat` no
  longer read memory past the limit if *precision* is specified.

- bpo-35504: Fix segfaults and :exc:`SystemError`\ s when deleting certain
  attributes. Patch by Zackery Spytz.

- bpo-35368: :c:func:`PyMem_Malloc` is now also thread-safe in debug mode.

- bpo-35214: Fixed an out of bounds memory access when parsing a truncated
  unicode escape sequence at the end of a string such as ``u'\N'``.  It
  would read one byte beyond the end of the memory allocation.

- bpo-34974: The :class:`bytearray` constructor no longer convert unexpected
  exceptions (e.g. :exc:`MemoryError` and :exc:`KeyboardInterrupt`) to
  :exc:`TypeError`.

- bpo-22851: Fix a segfault when accessing
  ``generator.gi_frame.f_restricted`` when the generator is exhausted.
  Patch by Zackery Spytz.

- bpo-18560: Fix potential NULL pointer dereference in sum().

- bpo-34400: Fix undefined behavior in parsetok.c.  Patch by Zackery Spytz.

- bpo-25083: Adding I/O error checking when reading .py files and aborting
  importing on error.

- bpo-25943: Fix potential heap corruption in the :mod:`bsddb` module.
  Patch by Zackery Spytz.

- bpo-34068: In :meth:`io.IOBase.close`, ensure that the
  :attr:`~io.IOBase.closed` attribute is not set with a live exception.
  Patch by Zackery Spytz and Serhiy Storchaka.

- bpo-34080: Fixed a memory leak in the compiler when it raised some
  uncommon errors during tokenizing.

- bpo-33956: Update vendored Expat library copy to version 2.2.5.

- bpo-30654: Fixed reset of the SIGINT handler to SIG_DFL on interpreter
  shutdown even when there was a custom handler set previously. Patch by
  Philipp Kerling.

- bpo-33645: Fixed an "unknown parsing error" on parsing the "<>" operator
  when run Python with both options ``-3`` and ``-We``.

- bpo-33622: Fixed a leak when the garbage collector fails to add an object
  with the ``__del__`` method or referenced by it into the
  :data:`gc.garbage` list. :c:func:`PyGC_Collect` can now be called when an
  exception is set and preserves it.

- bpo-33391: Fix a leak in set_symmetric_difference().

- bpo-25750: Fix rare Python crash due to bad refcounting in
  ``type_getattro()`` if a descriptor deletes itself from the class. Patch
  by Jeroen Demeyer.

- bpo-25862: Fix assertion failures in the ``tell()`` method of
  ``io.TextIOWrapper``. Patch by Zackery Spytz.

Library
-------

- bpo-8765: The write() method of buffered and unbuffered binary streams in
  the io module emits now a DeprecationWarning in Py3k mode for unicode
  argument.

- bpo-35052: Fix xml.dom.minidom cloneNode() on a document with an entity:
  pass the correct arguments to the user data handler of an entity.

- bpo-10496: :func:`~distutils.utils.check_environ` of
  :mod:`distutils.utils` now catchs :exc:`KeyError` on calling
  :func:`pwd.getpwuid`: don't create the ``HOME`` environment variable in
  this case.

- bpo-10496: :func:`posixpath.expanduser` now returns the input *path*
  unchanged if the ``HOME`` environment variable is not set and the current
  user has no home directory (if the current user identifier doesn't exist
  in the password database). This change fix the :mod:`site` module if the
  current user doesn't exist in the password database (if the user has no
  home directory).

- bpo-24746: Avoid stripping trailing whitespace in doctest fancy diff.
  Orignial patch by R. David Murray & Jairo Trad. Enhanced by Sanyam
  Khurana.

- bpo-35277: Update ensurepip to install pip 18.1 and setuptools 40.6.2.

- bpo-35062: Fix incorrect parsing of
  :class:`_io.IncrementalNewlineDecoder`'s *translate* argument.

- bpo-35079: Improve difflib.SequenceManager.get_matching_blocks doc by
  adding 'non- overlapping' and changing '!=' to '<'.

- bpo-35017: :meth:`socketserver.BaseServer.serve_forever` now exits
  immediately if it's :meth:`~socketserver.BaseServer.shutdown` method is
  called while it is polling for new events.

- bpo-34794: Fixed a leak in Tkinter when pass the Python wrapper around
  Tcl_Obj back to Tcl/Tk.

- bpo-23420: Verify the value for the parameter '-s' of the cProfile CLI.
  Patch by Robert Kuska

- bpo-16965: The :term:`2to3` :2to3fixer:`execfile` fixer now opens the file
  with mode ``'rb'``.  Patch by Zackery Spytz.

- bpo-34936: Fix ``TclError`` in ``tkinter.Spinbox.selection_element()``.
  Patch by Juliette Monsel.

- bpo-34866: Adding ``max_num_fields`` to ``cgi.FieldStorage`` to make DOS
  attacks harder by limiting the number of ``MiniFieldStorage`` objects
  created by ``FieldStorage``.

- bpo-34738: ZIP files created by :mod:`distutils` will now include entries
  for directories.

- bpo-34652: Ensure :func:`os.lchmod` is never defined on Linux.

- bpo-34625: Update vendorized expat library version to 2.2.6.

- bpo-34610: Fixed iterator of :class:`multiprocessing.managers.DictProxy`.

- bpo-34530: ``distutils.spawn.find_executable()`` now falls back on
  :data:`os.defpath` if the ``PATH`` environment variable is not set.

- bpo-34472: Improved compatibility for streamed files in :mod:`zipfile`.
  Previously an optional signature was not being written and certain ZIP
  applications were not supported. Patch by Silas Sewell.

- bpo-6700: Fix inspect.getsourcelines for module level frames/tracebacks.
  Patch by Vladimir Matveev.

- bpo-31715: Associate ``.mjs`` file extension with
  ``application/javascript`` MIME Type.

- bpo-32947: Add OP_ENABLE_MIDDLEBOX_COMPAT and test workaround for TLSv1.3
  for future compatibility with OpenSSL 1.1.1.

- bpo-34341: Appending to the ZIP archive with the ZIP64 extension no longer
  grows the size of extra fields of existing entries.

- bpo-34052: :meth:`sqlite3.Connection.create_aggregate`,
  :meth:`sqlite3.Connection.create_function`,
  :meth:`sqlite3.Connection.set_authorizer`,
  :meth:`sqlite3.Connection.set_progress_handler` methods raises TypeError
  when unhashable objects are passed as callable. These methods now don't
  pass such objects to SQLite API. Previous behavior could lead to
  segfaults. Patch by Sergey Fedoseev.

- bpo-34019: webbrowser: Correct the arguments passed to Opera Browser when
  opening a new URL using the ``webbrowser`` module. Patch by Bumsik Kim.

- bpo-33974: Fixed passing lists and tuples of strings containing special
  characters ``"``, ``\``, ``{``, ``}`` and ``\n`` as options to
  :mod:`~tkinter.ttk` widgets.

- bpo-26544: Fixed implementation of :func:`platform.libc_ver`. It almost
  always returned version '2.9' for glibc.

- bpo-33767: The concatenation (``+``) and repetition (``*``) sequence
  operations now raise :exc:`TypeError` instead of :exc:`SystemError` when
  performed on :class:`mmap.mmap` objects.  Patch by Zackery Spytz.

- bpo-11874: Use a better regex when breaking usage into wrappable parts.
  Avoids bogus assertion errors from custom metavar strings.

- bpo-33570: Change TLS 1.3 cipher suite settings for compatibility with
  OpenSSL 1.1.1-pre6 and newer. OpenSSL 1.1.1 will have TLS 1.3 cipers
  enabled by default.

- bpo-33542: Prevent ``uuid.get_node`` from using a DUID instead of a MAC on
  Windows. Patch by Zvi Effron

- bpo-33096: Removed unintentionally backported from Python 3 Tkinter files.

- bpo-20087: Updated alias mapping with glibc 2.27 supported locales.

- bpo-33422: Fix trailing quotation marks getting deleted when looking up
  byte/string literals on pydoc. Patch by Andrés Delfino.

- bpo-33336: ``imaplib`` now allows ``MOVE`` command in ``IMAP4.uid()`` (RFC
  6851: IMAP MOVE Extension) and potentially as a name of supported method
  of ``IMAP4`` object.

- bpo-33359: Fix running ``python -m curses.has_key``.

- bpo-33131: Upgrade bundled version of pip to 10.0.1.

- bpo-33308: Fixed a crash in the :mod:`parser` module when converting an ST
  object to a tree of tuples or lists with ``line_info=False`` and
  ``col_info=True``.

- bpo-33256: Fix display of ``<module>`` call in the html produced by
  ``cgitb.html()``. Patch by Stéphane Blondon.

- bpo-32861: The urllib.robotparser's ``__str__`` representation now
  includes wildcard entries and the "Crawl-delay" and "Request-rate" fields.
  Patch by Michael Lazar.

- bpo-33038: gzip.GzipFile no longer produces an AttributeError exception
  when used with a file object with a non-string name attribute. Patch by Bo
  Bayles.

- bpo-32857: In :mod:`tkinter`, ``after_cancel(None)`` now raises a
  :exc:`ValueError` instead of canceling the first scheduled function.
  Patch by Cheryl Sabella.

- bpo-32502: uuid.uuid1 no longer raises an exception if a 64-bit hardware
  address is encountered.

- bpo-31608: Raise a ``TypeError`` instead of crashing if a
  ``collections.deque`` subclass returns a non-deque from ``__new__``. Patch
  by Oren Milman.

- bpo-16865: Support arrays >=2GiB in :mod:`ctypes`.  Patch by Segev Finer.

- bpo-29456: Fix bugs in hangul normalization: u1176, u11a7 and u11c3

Documentation
-------------

- bpo-35035: Rename documentation for :mod:`email.utils` to
  ``email.utils.rst``.

- bpo-34967: Use app.add_object_type() instead of the deprecated Sphinx
  function app.description_unit()

- bpo-13407: Add a note to :mod:`bz2` and :mod:`tarfile` stating that
  handling of multi-stream bzip2 files is not supported.

- bpo-33503: Fix broken pypi link

Tests
-----

- bpo-34279: :func:`test.support.run_unittest` no longer raise
  :exc:`TestDidNotRun` if the test result contains skipped tests. The
  exception is now only raised if no test have been run and no test have
  been skipped.

- bpo-34279: regrtest issue a warning when no tests have been executed in a
  particular test file. Also, a new final result state is issued if no test
  have been executed across all test files. Patch by Pablo Galindo.

- bpo-34661: Fix test_shutil if unzip doesn't support -t.

- bpo-34542: Use 3072 RSA keys and SHA-256 signature for test certs and
  keys.

- bpo-34391: Fix ftplib test for TLS 1.3 by reading from data socket.

- bpo-34399: Update all RSA keys and DH params to use at least 2048 bits.

- bpo-33901: Fix test_gdbm on macOS with gdbm 1.15: add a larger value to
  make sure that the file size changes.

- bpo-33873: Fix a bug in ``regrtest`` that caused an extra test to run if
  --huntrleaks/-R was used. Exit with error in case that invalid parameters
  are specified to --huntrleaks/-R (at least one warmup run and one
  repetition must be used).

- bpo-29512: Rename Lib/test/bisect.py to Lib/test/bisect_cmd.py. The old
  name was in conflict with Lib/bisect.py, causing test failures, depending
  how tests were run.

- bpo-32962: Fixed test_gdb when Python is compiled with flags -mcet
  -fcf-protection -O0.

- bpo-33354: Skip ``test_ssl.test_load_dh_params`` when Python filesystem
  encoding cannot encode the provided path.

- bpo-19417: Add test_bdb.py.

Build
-----

- bpo-35139: Fix a compiler error when statically linking `pyexpat` in
  `Modules/Setup`.

- bpo-34710: Fixed SSL module build with OpenSSL & pedantic CFLAGS.

- bpo-33015: Fix an undefined behaviour in the pthread implementation of
  :c:func:`PyThread_start_new_thread`: add a function wrapper to always
  return ``NULL``.

- bpo-30345: Add -g to LDFLAGS when compiling with LTO to get debug symbols.

Windows
-------

- bpo-35401: Updates Windows build to OpenSSL 1.0.2q

- bpo-34603: Fix returning structs from functions produced by MSVC

- bpo-33711: Fixed licence generation error when building the installer.

macOS
-----

- bpo-15663: The macOS 10.6+ installer now provides a private copy of Tcl/Tk
  8.6, like the 10.9+ installer does.

- bpo-35401: Update macOS installer to use OpenSSL 1.0.2q.

- bpo-34405: Update to OpenSSL 1.0.2p for macOS installer builds.

IDLE
----

- bpo-34275: Make IDLE calltips always visible on Mac. Some MacOS-tk
  combinations need .update_idletasks(). Patch by Kevin Walzer.

- bpo-34120: Fix unresponsiveness after closing certain windows and dialogs.

- bpo-33856: Add "help" in the welcome message of IDLE

- bpo-31500: Default fonts now are scaled on HiDPI displays.

Tools/Demos
-----------

- bpo-34989: python-gdb.py now handles errors on computing the line number
  of a Python frame.

- bpo-34500: Fix 2 ResourceWarning in difflib.py. Patch by Mickaël
  Schoentgen.

- bpo-29367: python-gdb.py now supports also method-wrapper (wrapperobject)
  objects.

- bpo-32962: python-gdb now catchs ``UnicodeDecodeError`` exceptions when
  calling ``string()``.

- bpo-32962: python-gdb now catchs ValueError on read_var(): when Python has
  no debug symbols for example.

C API
-----

- bpo-33817: Fixed :c:func:`_PyString_Resize` and
  :c:func:`_PyUnicode_Resize` for empty strings. This fixed also
  :c:func:`PyString_FromFormat` and :c:func:`PyUnicode_FromFormat` when they
  return an empty string (e.g. ``PyString_FromFormat("%s", "")``).

- bpo-34229: Check start and stop of slice object to be long when they are
  not int in :c:func:`PySlice_GetIndices`.

- bpo-23927: Fixed :exc:`SystemError` in
  :c:func:`PyArg_ParseTupleAndKeywords` when the ``w*`` format unit is used
  for optional parameter.


What's New in Python 2.7.15 final?
==================================

*Release date: 2018-04-29*

Core and Builtins
-----------------

- bpo-33374: Tweak the definition of PyGC_Head, so compilers do not believe
  it is always 16-byte aligned on x86. This prevents crashes with more
  aggressive optimizations present in GCC 8.


What's New in Python 2.7.15 release candidate 1?
================================================

*Release date: 2018-04-14*

Security
--------

- bpo-32997: A regex in fpformat was vulnerable to catastrophic
  backtracking. This regex was a potential DOS vector (REDOS). Based on
  typical uses of fpformat the risk seems low. The regex has been refactored
  and is now safe. Patch by Jamie Davis.

- bpo-32981: Regexes in difflib and poplib were vulnerable to catastrophic
  backtracking. These regexes formed potential DOS vectors (REDOS). They
  have been refactored. This resolves CVE-2018-1060 and CVE-2018-1061. Patch
  by Jamie Davis.

- bpo-31339: Rewrite time.asctime() and time.ctime(). Backport and adapt the
  _asctime() function from the master branch to not depend on the
  implementation of asctime() and ctime() from the external C library. This
  change fixes a bug when Python is run using the musl C library.

- bpo-30730: Prevent environment variables injection in subprocess on
  Windows.  Prevent passing other environment variables and command
  arguments.

- bpo-30694: Upgrade expat copy from 2.2.0 to 2.2.1 to get fixes of multiple
  security vulnerabilities including: CVE-2017-9233 (External entity
  infinite loop DoS), CVE-2016-9063 (Integer overflow, re-fix),
  CVE-2016-0718 (Fix regression bugs from 2.2.0's fix to CVE-2016-0718) and
  CVE-2012-0876 (Counter hash flooding with SipHash). Note: the
  CVE-2016-5300 (Use os-specific entropy sources like getrandom) doesn't
  impact Python, since Python already gets entropy from the OS to set the
  expat secret using ``XML_SetHashSalt()``.

- bpo-30500: Fix urllib.splithost() to correctly parse fragments. For
  example, ``splithost('//127.0.0.1#@evil.com/')`` now correctly returns the
  ``127.0.0.1`` host, instead of treating ``@evil.com`` as the host in an
  authentification (``login@host``).

- bpo-29591: Update expat copy from 2.1.1 to 2.2.0 to get fixes of
  CVE-2016-0718 and CVE-2016-4472. See
  https://sourceforge.net/p/expat/bugs/537/ for more information.

Core and Builtins
-----------------

- bpo-33026: Fixed jumping out of "with" block by setting f_lineno.

- bpo-17288: Prevent jumps from 'return' and 'exception' trace events.

- bpo-18533: ``repr()`` on a dict containing its own ``viewvalues()`` or
  ``viewitems()`` no longer raises ``RuntimeError``.  Instead, use ``...``,
  as for other recursive structures.  Patch by Ben North.

- bpo-10544: Yield expressions are now deprecated in comprehensions and
  generator expressions when checking Python 3 compatibility. They are still
  permitted in the definition of the outermost iterable, as that is
  evaluated directly in the enclosing scope.

- bpo-32137: The repr of deeply nested dict now raises a RecursionError
  instead of crashing due to a stack overflow.

- bpo-20047: Bytearray methods partition() and rpartition() now accept only
  bytes-like objects as separator, as documented.  In particular they now
  raise TypeError rather of returning a bogus result when an integer is
  passed as a separator.

- bpo-31733: Add a new PYTHONSHOWREFCOUNT environment variable. In debug
  mode, Python now only print the total reference count if
  PYTHONSHOWREFCOUNT is set.

- bpo-31692: Add a new PYTHONSHOWALLOCCOUNT environment variable. When
  Python is compiled with COUNT_ALLOCS, PYTHONSHOWALLOCCOUNT now has to be
  set to dump allocation counts into stderr on shutdown. Moreover,
  allocations statistics are now dumped into stderr rather than stdout.

- bpo-31478: Prevent unwanted behavior in `_random.Random.seed()` in case
  the argument has a bad ``__abs__()`` method. Patch by Oren Milman.

- bpo-31530: Fixed crashes when iterating over a file on multiple threads.

- bpo-31490: Fix an assertion failure in `ctypes` class definition, in case
  the class has an attribute whose name is specified in ``_anonymous_`` but
  not in ``_fields_``. Patch by Oren Milman.

- bpo-31411: Raise a TypeError instead of SystemError in case
  warnings.onceregistry is not a dictionary. Patch by Oren Milman.

- bpo-31343: Include sys/sysmacros.h for major(), minor(), and makedev().
  GNU C libray plans to remove the functions from sys/types.h.

- bpo-31311: Fix a crash in the ``__setstate__()`` method of
  `ctypes._CData`, in case of a bad ``__dict__``. Patch by Oren Milman.

- bpo-31243: Fix a crash in some methods of `io.TextIOWrapper`, when the
  decoder's state is invalid. Patch by Oren Milman.

- bpo-31095: Fix potential crash during GC caused by ``tp_dealloc`` which
  doesn't call ``PyObject_GC_UnTrack()``.

- bpo-30657: Fixed possible integer overflow in PyString_DecodeEscape. Patch
  by Jay Bosamiya.

- bpo-27945: Fixed various segfaults with dict when input collections are
  mutated during searching, inserting or comparing.  Based on patches by
  Duane Griffin and Tim Mitchell.

- bpo-25794: Fixed type.__setattr__() and type.__delattr__() for
  non-interned or unicode attribute names.  Based on patch by Eryk Sun.

- bpo-29935: Fixed error messages in the index() method of tuple and list
  when pass indices of wrong type.

- bpo-28598: Support __rmod__ for subclasses of str being called before
  str.__mod__. Patch by Martijn Pieters.

- bpo-29602: Fix incorrect handling of signed zeros in complex constructor
  for complex subclasses and for inputs having a __complex__ method. Patch
  by Serhiy Storchaka.

- bpo-29347: Fixed possibly dereferencing undefined pointers when creating
  weakref objects.

- bpo-14376: Allow sys.exit to accept longs as well as ints. Patch by Gareth
  Rees.

- bpo-29028: Fixed possible use-after-free bugs in the subscription of the
  buffer object with custom index object.

- bpo-29145: Fix overflow checks in string, bytearray and unicode. Patch by
  jan matejek and Xiang Zhang.

- bpo-28932: Do not include <sys/random.h> if it does not exist.

Library
-------

- bpo-33096: Allow ttk.Treeview.insert to insert iid that has a false
  boolean value. Note iid=0 and iid=False would be same. Patch by Garvit
  Khatri.

- bpo-33127: The ssl module now compiles with LibreSSL 2.7.1.

- bpo-30622: The ssl module now detects missing NPN support in LibreSSL.

- bpo-21060: Rewrite confusing message from setup.py upload from "No dist
  file created in earlier command" to the more helpful "Must create and
  upload files in one command".

- bpo-30157: Fixed guessing quote and delimiter in csv.Sniffer.sniff() when
  only the last field is quoted.  Patch by Jake Davis.

- bpo-32647: The ctypes module used to depend on indirect linking for
  dlopen. The shared extension is now explicitly linked against libdl on
  platforms with dl.

- bpo-32304: distutils' upload command no longer corrupts tar files ending
  with a CR byte, and no longer tries to convert CR to CRLF in any of the
  upload text fields.

- bpo-31848: Fix the error handling in Aifc_read.initfp() when the SSND
  chunk is not found. Patch by Zackery Spytz.

- bpo-32521: The nis module is now compatible with new libnsl and headers
  location.

- bpo-32539: Fix ``OSError`` for ``os.listdir`` with deep paths (starting
  with ``\\?\``) on windows.  Patch by Anthony Sottile.

- bpo-32521: glibc has removed Sun RPC. Use replacement libtirpc headers and
  library in nis module.

- bpo-18035: ``telnetlib``: ``select.error`` doesn't have an ``errno``
  attribute. Patch by Segev Finer.

- bpo-32185: The SSL module no longer sends IP addresses in SNI TLS
  extension on platforms with OpenSSL 1.0.2+ or inet_pton.

- bpo-32186: Creating io.FileIO() and builtin file() objects now release the
  GIL when checking the file descriptor. io.FileIO.readall(),
  io.FileIO.read(), and file.read() now release the GIL when getting the
  file size.  Fixed hang of all threads with inaccessible NFS server.  Patch
  by Nir Soffer.

- bpo-32110: ``codecs.StreamReader.read(n)`` now returns not more than *n*
  characters/bytes for non-negative *n*. This makes it compatible with
  ``read()`` methods of other file-like objects.

- bpo-21149: Silence a `'NoneType' object is not callable` in
  `_removeHandlerRef` error that could happen when a logging Handler is
  destroyed as part of cyclic garbage collection during process shutdown.

- bpo-31764: Prevent a crash in ``sqlite3.Cursor.close()`` in case the
  ``Cursor`` object is uninitialized. Patch by Oren Milman.

- bpo-31955: Fix CCompiler.set_executable() of distutils to handle properly
  Unicode strings.

- bpo-9678: Fixed determining the MAC address in the uuid module:

  * Using ifconfig on NetBSD and OpenBSD.
  * Using arp on Linux, FreeBSD, NetBSD and OpenBSD.

  Based on patch by Takayuki Shimizukawa.

- bpo-30057: Fix potential missed signal in signal.signal().

- bpo-31927: Fixed reading arbitrary data when parse a AF_BLUETOOTH address
  on NetBSD and DragonFly BSD.

- bpo-27666: Fixed stack corruption in curses.box() and curses.ungetmouse()
  when the size of types chtype or mmask_t is less than the size of C long.
  curses.box() now accepts characters as arguments.  Based on patch by Steve
  Fink.

- bpo-25720: Fix the method for checking pad state of curses WINDOW. Patch
  by Masayuki Yamamoto.

- bpo-31893: Fixed the layout of the kqueue_event structure on OpenBSD and
  NetBSD. Fixed the comparison of the kqueue_event objects.

- bpo-31891: Fixed building the curses module on NetBSD.

- bpo-30058: Fixed buffer overflow in select.kqueue.control().

- bpo-31770: Prevent a crash when calling the ``__init__()`` method of a
  ``sqlite3.Cursor`` object more than once. Patch by Oren Milman.

- bpo-31728: Prevent crashes in `_elementtree` due to unsafe cleanup of
  `Element.text` and `Element.tail`. Patch by Oren Milman.

- bpo-31752: Fix possible crash in timedelta constructor called with custom
  integers.

- bpo-31681: Fix pkgutil.get_data to avoid leaking open files.

- bpo-31675: Fixed memory leaks in Tkinter's methods splitlist() and split()
  when pass a string larger than 2 GiB.

- bpo-30806: Fix the string representation of a netrc object.

- bpo-30347: Stop crashes when concurrently iterate over itertools.groupby()
  iterators.

- bpo-25732: `functools.total_ordering()` now implements the `__ne__`
  method.

- bpo-31351: python -m ensurepip now exits with non-zero exit code if pip
  bootstrapping has failed.

- bpo-31544: The C accelerator module of ElementTree ignored exceptions
  raised when looking up TreeBuilder target methods in XMLParser().

- bpo-31455: The C accelerator module of ElementTree ignored exceptions
  raised when looking up TreeBuilder target methods in XMLParser().

- bpo-25404: SSLContext.load_dh_params() now supports non-ASCII path.

- bpo-28958: ssl.SSLContext() now uses OpenSSL error information when a
  context cannot be instantiated.

- bpo-27448: Work around a `gc.disable()` race condition in the `subprocess`
  module that could leave garbage collection disabled when multiple threads
  are spawning subprocesses at once.  Users are *strongly encouraged* to use
  the `subprocess32` module from PyPI on Python 2.7 instead, it is much more
  reliable.

- bpo-31170: expat: Update libexpat from 2.2.3 to 2.2.4. Fix copying of
  partial characters for UTF-8 input (libexpat bug 115):
  https://github.com/libexpat/libexpat/issues/115

- bpo-29136: Add TLS 1.3 cipher suites and OP_NO_TLSv1_3.

- bpo-31334: Fix ``poll.poll([timeout])`` in the ``select`` module for
  arbitrary negative timeouts on all OSes where it can only be a
  non-negative integer or -1. Patch by Riccardo Coccioli.

- bpo-10746: Fix ctypes producing wrong PEP 3118 type codes for integer
  types.

- bpo-30102: The ssl and hashlib modules now call
  OPENSSL_add_all_algorithms_noconf() on OpenSSL < 1.1.0. The function
  detects CPU features and enables optimizations on some CPU architectures
  such as POWER8. Patch is based on research from Gustavo Serra Scalet.

- bpo-30502: Fix handling of long oids in ssl.  Based on patch by Christian
  Heimes.

- bpo-25684: Change ``ttk.OptionMenu`` radiobuttons to be unique across
  instances of ``OptionMenu``.

- bpo-29169: Update zlib to 1.2.11.

- bpo-30746: Prohibited the '=' character in environment variable names in
  ``os.putenv()`` and ``os.spawn*()``.

- bpo-30418: On Windows, subprocess.Popen.communicate() now also ignore
  EINVAL on stdin.write() if the child process is still running but closed
  the pipe.

- bpo-30378: Fix the problem that logging.handlers.SysLogHandler cannot
  handle IPv6 addresses.

- bpo-29960: Preserve generator state when _random.Random.setstate() raises
  an exception. Patch by Bryan Olson.

- bpo-30310: tkFont now supports unicode options (e.g. font family).

- bpo-30414: multiprocessing.Queue._feed background running thread do not
  break from main loop on exception.

- bpo-30003: Fix handling escape characters in HZ codec.  Based on patch by
  Ma Lin.

- bpo-30375: Warnings emitted when compile a regular expression now always
  point to the line in the user code.  Previously they could point into
  inners of the re module if emitted from inside of groups or conditionals.

- bpo-30363: Running Python with the -3 option now warns about regular
  expression syntax that is invalid or has different semantic in Python 3 or
  will change the behavior in future Python versions.

- bpo-30365: Running Python with the -3 option now emits deprecation
  warnings for getchildren() and getiterator() methods of the Element class
  in the xml.etree.cElementTree module and when pass the html argument to
  xml.etree.ElementTree.XMLParser().

- bpo-30365: Fixed a deprecation warning about the doctype() method of the
  xml.etree.ElementTree.XMLParser class.  Now it is emitted only when define
  the doctype() method in the subclass of XMLParser.

- bpo-30329: imaplib now catchs the Windows socket WSAEINVAL error (code
  10022) on shutdown(SHUT_RDWR): An invalid operation was attempted. This
  error occurs sometimes on SSL connections.

- bpo-30342: Fix sysconfig.is_python_build() if Python is built with Visual
  Studio 2008 (VS 9.0).

- bpo-29990: Fix range checking in GB18030 decoder.  Original patch by Ma
  Lin.

- bpo-30243: Removed the __init__ methods of _json's scanner and encoder.
  Misusing them could cause memory leaks or crashes.  Now scanner and
  encoder objects are completely initialized in the __new__ methods.

- bpo-26293: Change resulted because of zipfile breakage. (See also:
  bpo-29094)

- bpo-30070: Fixed leaks and crashes in errors handling in the parser
  module.

- bpo-30061: Fixed crashes in IOBase methods next() and readlines() when
  readline() or next() respectively return non-sizeable object. Fixed
  possible other errors caused by not checking results of PyObject_Size(),
  PySequence_Size(), or PyMapping_Size().

- bpo-30011: Fixed race condition in HTMLParser.unescape().

- bpo-30068: _io._IOBase.readlines will check if it's closed first when hint
  is present.

- bpo-27863: Fixed multiple crashes in ElementTree caused by race conditions
  and wrong types.

- bpo-29942: Fix a crash in itertools.chain.from_iterable when encountering
  long runs of empty iterables.

- bpo-29861: Release references to tasks, their arguments and their results
  as soon as they are finished in multiprocessing.Pool.

- bpo-27880: Fixed integer overflow in cPickle when pickle large strings or
  too many objects.

- bpo-29110: Fix file object leak in aifc.open() when file is given as a
  filesystem path and is not in valid AIFF format. Original patch by Anthony
  Zhang.

- bpo-29354: Fixed inspect.getargs() for parameters which are cell
  variables.

- bpo-29335: Fix subprocess.Popen.wait() when the child process has exited
  to a stopped instead of terminated state (ex: when under ptrace).

- bpo-29219: Fixed infinite recursion in the repr of uninitialized
  ctypes.CDLL instances.

- bpo-29082: Fixed loading libraries in ctypes by unicode names on Windows.
  Original patch by Chi Hsuan Yen.

- bpo-29188: Support glibc 2.24 on Linux: don't use getentropy() function
  but read from /dev/urandom to get random bytes, for example in
  os.urandom(). On Linux, getentropy() is implemented which getrandom() is
  blocking mode, whereas os.urandom() should not block.

- bpo-29142: In urllib, suffixes in no_proxy environment variable with
  leading dots could match related hostnames again (e.g. .b.c matches
  a.b.c). Patch by Milan Oberkirch.

- bpo-13051: Fixed recursion errors in large or resized
  curses.textpad.Textbox.  Based on patch by Tycho Andersen.

- bpo-9770: curses.ascii predicates now work correctly with negative
  integers.

- bpo-28427: old keys should not remove new values from WeakValueDictionary
  when collecting from another thread.

- bpo-28998: More APIs now support longs as well as ints.

- bpo-28923: Remove editor artifacts from Tix.py, including encoding not
  recognized by codecs.lookup.

- bpo-29019: Fix dict.fromkeys(x) overallocates when x is sparce dict.
  Original patch by Rasmus Villemoes.

- bpo-19542: Fix bugs in WeakValueDictionary.setdefault() and
  WeakValueDictionary.pop() when a GC collection happens in another thread.

- bpo-28925: cPickle now correctly propagates errors when unpickle instances
  of old-style classes.

Documentation
-------------

- bpo-27212: Modify documentation for the :func:`islice` recipe to consume
  initial values up to the start index.

- bpo-32800: Update link to w3c doc for xml default namespaces.

- bpo-17799: Explain real behaviour of sys.settrace and sys.setprofile and
  their C-API counterparts regarding which type of events are received in
  each function. Patch by Pablo Galindo Salgado.

- bpo-8243: Add a note about curses.addch and curses.addstr exception
  behavior when writing outside a window, or pad.

- bpo-21649: Add RFC 7525 and Mozilla server side TLS links to SSL
  documentation.

- bpo-30176: Add missing attribute related constants in curses
  documentation.

- bpo-28929: Link the documentation to its source file on GitHub.

- bpo-26355: Add canonical header link on each page to corresponding major
  version of the documentation. Patch by Matthias Bussonnier.

- bpo-12067: Rewrite Comparisons section in the Expressions chapter of the
  language reference. Some of the details of comparing mixed types were
  incorrect or ambiguous. Added default behaviour and consistency
  suggestions for user-defined classes. Based on patch from Andy Maier.

Tests
-----

- bpo-31719: Fix test_regrtest.test_crashed() on s390x. Add a new
  _testcapi._read_null() function to crash Python in a reliable way on
  s390x. On s390x, ctypes.string_at(0) returns an empty string rather than
  crashing.

- bpo-31518: Debian Unstable has disabled TLS 1.0 and 1.1 for
  SSLv23_METHOD(). Change TLS/SSL protocol of some tests to PROTOCOL_TLS or
  PROTOCOL_TLSv1_2 to make them pass on Debian.

- bpo-25674: Remove sha256.tbs-internet.com ssl test

- bpo-11790: Fix sporadic failures in
  test_multiprocessing.WithProcessesTestCondition.

- bpo-30236: Backported test.regrtest options -m/--match and -G/--failfast
  from Python 3.

- bpo-30223: To unify running tests in Python 2.7 and Python 3, the test
  package can be run as a script.  This is equivalent to running the
  test.regrtest module as a script.

- bpo-30207: To simplify backports from Python 3, the test.test_support
  module was converted into a package and renamed to test.support.  The
  test.script_helper module was moved into the test.support package. Names
  test.test_support and test.script_helper are left as aliases to
  test.support and test.support.script_helper.

- bpo-30197: Enhanced function swap_attr() in the test.test_support module.
  It now works when delete replaced attribute inside the with statement.
  The old value of the attribute (or None if it doesn't exist) now will be
  assigned to the target of the "as" clause, if there is one. Also
  backported function swap_item().

- bpo-28087: Skip test_asyncore and test_eintr poll failures on macOS. Skip
  some tests of select.poll when running on macOS due to unresolved issues
  with the underlying system poll function on some macOS versions.

- bpo-15083: Convert ElementTree doctests to unittests.

Build
-----

- bpo-33163: Upgrade pip to 9.0.3 and setuptools to v39.0.1.

- bpo-32616: Disable computed gotos by default for clang < 5.0. It caused
  significant performance regression.

- bpo-32635: Fix segfault of the crypt module when libxcrypt is provided
  instead of libcrypt at the system.

- bpo-31934: Abort the build when building out of a not clean source tree.

- bpo-31474: Fix -Wint-in-bool-context warnings in PyMem_MALLOC and
  PyMem_REALLOC macros

- bpo-29243: Prevent unnecessary rebuilding of Python during ``make test``,
  ``make install`` and some other make targets when configured with
  ``--enable-optimizations``.

- bpo-23404: Don't regenerate generated files based on file modification
  time anymore: the action is now explicit. Replace ``make touch`` with
  ``make regen-all``.

- bpo-27593: sys.version and the platform module python_build(),
  python_branch(), and python_revision() functions now use git information
  rather than hg when building from a repo.

- bpo-29643: Fix ``--enable-optimization`` configure option didn't work.

- bpo-29572: Update Windows build and OS X installers to use OpenSSL 1.0.2k.

- bpo-28768: Fix implicit declaration of function _setmode. Patch by
  Masayuki Yamamoto

Windows
-------

- bpo-33184: Update Windows build to use OpenSSL 1.0.2o.

- bpo-32903: Fix a memory leak in os.chdir() on Windows if the current
  directory is set to a UNC path.

- bpo-30855: Bump Tcl/Tk to 8.5.19.

- bpo-30450: Pull build dependencies from GitHub rather than svn.python.org.

macOS
-----

- bpo-32726: Provide an additional, more modern macOS installer variant that
  supports macOS 10.9+ systems in 64-bit mode only. Upgrade the supplied
  third-party libraries to OpenSSL 1.0.2n and SQLite 3.22.0. The 10.9+
  installer now supplies its own private copy of Tcl/Tk 8.6.8.

- bpo-24414: Default macOS deployment target is now set by ``configure`` to
  the build system's OS version (as is done by Python 3), not ``10.4``;
  override with, for example, ``./configure MACOSX_DEPLOYMENT_TARGET=10.4``.

- bpo-17128: All 2.7 macOS installer variants now supply their own version
  of ``OpenSSL 1.0.2``; the Apple-supplied SSL libraries and root
  certificates are not longer used.  The ``Installer Certificate`` command
  in ``/Applications/Python 2.7`` may be used to download and install a
  default set of root certificates from the third-party ``certifi`` package.

- bpo-11485: python.org macOS Pythons no longer supply a default SDK value
  (e.g. ``-isysroot /``) or specific compiler version default (e.g.
  ``gcc-4.2``) when building extension modules.  Use ``CC``, ``SDKROOT``,
  and ``DEVELOPER_DIR`` environment variables to override compilers or to
  use an SDK.  See Apple's ``xcrun`` man page for more info.

- bpo-33184: Update macOS installer build to use OpenSSL 1.0.2o.

Tools/Demos
-----------

- bpo-31920: Fixed handling directories as arguments in the ``pygettext``
  script. Based on patch by Oleg Krasnikov.

- bpo-30109: Fixed Tools/scripts/reindent.py for non-ASCII files. It now
  processes files as binary streams. This also fixes "make reindent".

- bpo-24960: 2to3 and lib2to3 can now read pickled grammar files using
  pkgutil.get_data() rather than probing the filesystem. This lets 2to3 and
  lib2to3 work when run from a zipfile.

C API
-----

- bpo-20891: Fix PyGILState_Ensure(). When PyGILState_Ensure() is called in
  a non-Python thread before PyEval_InitThreads(), only call
  PyEval_InitThreads() after calling PyThreadState_New() to fix a crash.

- bpo-31626: When Python is built in debug mode, the memory debug hooks now
  fail with a fatal error if realloc() fails to shrink a memory block,
  because the debug hook just erased freed bytes without keeping a copy of
  them.


What's New in Python 2.7.14 release candidate 1?
================================================

*Release date: 2017-08-26*

Security
--------

- bpo-30947: Upgrade libexpat embedded copy from version 2.2.1 to 2.2.3 to
  get security fixes.

Core and Builtins
-----------------

- bpo-30765: Avoid blocking in pthread_mutex_lock() when
  PyThread_acquire_lock() is asked not to block.

Library
-------

- bpo-31135: ttk: Fix LabeledScale and OptionMenu destroy() method. Call the
  parent destroy() method even if the used attribute doesn't exist. The
  LabeledScale.destroy() method now also explicitly clears label and scale
  attributes to help the garbage collector to destroy all widgets.

- bpo-31107: Fix `copy_reg._slotnames()` mangled attribute calculation for
  classes whose name begins with an underscore. Patch by Shane Harvey.

- bpo-29519: Fix weakref spewing exceptions during interpreter shutdown when
  used with a rare combination of multiprocessing and custom codecs.

- bpo-30119: ftplib.FTP.putline() now throws ValueError on commands that
  contains CR or LF. Patch by Dong-hee Na.

- bpo-30595: multiprocessing.Queue.get() with a timeout now polls its reader
  in non-blocking mode if it succeeded to aquire the lock but the acquire
  took longer than the timeout.

- bpo-29902: Py3k deprecation warning now is emitted when pickling or
  copying some builtin and extension objects that don't support pickling
  explicitly and are pickled incorrectly by default (like memoryview or
  staticmethod).  This is a TypeError in Python 3.6.

- bpo-29854: Fix segfault in readline when using readline's history-size
  option.  Patch by Nir Soffer.

- bpo-30807: signal.setitimer() may disable the timer when passed a tiny
  value.

  Tiny values (such as 1e-6) are valid non-zero values for setitimer(),
  which is specified as taking microsecond-resolution intervals. However, on
  some platform, our conversion routine could convert 1e-6 into a zero
  interval, therefore disabling the timer instead of (re-)scheduling it.

Tests
-----

- bpo-30715: Address ALPN callback changes for OpenSSL 1.1.0f. The latest
  version behaves like OpenSSL 1.0.2 and no longer aborts handshake.

- bpo-30822: Fix regrtest command line parser to allow passing -u
  extralargefile to run test_zipfile64.

- bpo-30283: regrtest: Enhance regrtest and backport features from the
  master branch.

  Add options: --coverage, --testdir, --list-tests (list test files, don't
  run them), --list-cases (list test identifiers, don't run them,
  :issue:`30523`), --matchfile (load a list of test filters from a text
  file, :issue:`30540`), --slowest (alias to --slow).

  Enhance output: add timestamp, test result, currently running tests,
  "Tests result: xxx" summary with total duration, etc.

  Fix reference leak hunting in regrtest, --huntrleaks: regrtest now warms
  up caches, create explicitly all internal singletons which are created on
  demand to prevent false positives when checking for reference leaks.
  (:issue:`30675`).


What's New in Python 2.7.13 final?
==================================

*Release date: 2016-12-17*

Core and Builtins
-----------------

- bpo-5322: Revert a37cc3d926ec.


What's New in Python 2.7.13 release candidate 1?
================================================

*Release date: 2016-12-03*

Core and Builtins
-----------------

- bpo-5322: Fixed setting __new__ to a PyCFunction inside Python code.
  Original patch by Andreas Stührk.

- bpo-28847: dumbdbm no longer writes the index file in when it is not
  changed and supports reading read-only files.

- bpo-11145: Fixed miscellaneous issues with C-style formatting of types
  with custom __oct__ and __hex__.

- bpo-24469: Fixed memory leak caused by int subclasses without overridden
  tp_free (e.g. C-inherited Cython classes).

- bpo-19398: Extra slash no longer added to sys.path components in case of
  empty compile-time PYTHONPATH components.

- bpo-21720: Improve exception message when the type of fromlist is unicode.
  fromlist parameter of __import__() only accepts str in Python 2 and this
  will help to identify the problem especially when the unicode_literals
  future import is used.

- bpo-26906: Resolving special methods of uninitialized type now causes
  implicit initialization of the type instead of a fail.

- bpo-18287: PyType_Ready() now checks that tp_name is not NULL. Original
  patch by Niklas Koep.

- bpo-24098: Fixed possible crash when AST is changed in process of
  compiling it.

- bpo-28350: String constants with null character no longer interned.

- bpo-27942: String constants now interned recursively in tuples and
  frozensets.

- bpo-15578: Correctly incref the parent module while importing.

- bpo-26307: The profile-opt build now applies PGO to the built-in modules.

- bpo-26020: set literal evaluation order did not match documented
  behaviour.

- bpo-27870: A left shift of zero by a large integer no longer attempts to
  allocate large amounts of memory.

- bpo-25604: Fix a minor bug in integer true division; this bug could
  potentially have caused off-by-one-ulp results on platforms with
  unreliable ldexp implementations.

- bpo-27473: Fixed possible integer overflow in str, unicode and bytearray
  concatenations and repetitions.  Based on patch by Xiang Zhang.

- bpo-27507: Add integer overflow check in bytearray.extend().  Patch by
  Xiang Zhang.

- bpo-27581: Don't rely on wrapping for overflow check in
  PySequence_Tuple().  Patch by Xiang Zhang.

- bpo-23908: os functions, open() and the io.FileIO constructor now reject
  unicode paths with embedded null character on Windows instead of silently
  truncating them.

- bpo-27514: Make having too many statically nested blocks a SyntaxError
  instead of SystemError.

Library
-------

- bpo-25659: In ctypes, prevent a crash calling the from_buffer() and
  from_buffer_copy() methods on abstract classes like Array.

- bpo-28563: Fixed possible DoS and arbitrary code execution when handle
  plural form selections in the gettext module.  The expression parser now
  supports exact syntax supported by GNU gettext.

- bpo-28387: Fixed possible crash in _io.TextIOWrapper deallocator when the
  garbage collector is invoked in other thread.  Based on patch by Sebastian
  Cufre.

- bpo-28449: tarfile.open() with mode "r" or "r:" now tries to open a tar
  file with compression before trying to open it without compression.
  Otherwise it had 50% chance failed with ignore_zeros=True.

- bpo-25464: Fixed HList.header_exists() in Tix module by adding a
  workaround to Tix library bug.

- bpo-28488: shutil.make_archive() no longer adds entry "./" to ZIP archive.

- bpo-28480: Fix error building _sqlite3 module when multithreading is
  disabled.

- bpo-24452: Make webbrowser support Chrome on Mac OS X.

- bpo-26293: Fixed writing ZIP files that starts not from the start of the
  file.  Offsets in ZIP file now are relative to the start of the archive in
  conforming to the specification.

- Fix possible integer overflows and crashes in the mmap module with unusual
  usage patterns.

- bpo-27897: Fixed possible crash in sqlite3.Connection.create_collation()
  if pass invalid string-like object as a name.  Original patch by Xiang
  Zhang.

- bpo-1703178: Fix the ability to pass the --link-objects option to the
  distutils build_ext command.

- bpo-28253: Fixed calendar functions for extreme months: 0001-01 and
  9999-12.

  Methods itermonthdays() and itermonthdays2() are reimplemented so that
  they don't call itermonthdates() which can cause datetime.date
  under/overflow.

- bpo-27963: Fixed possible null pointer dereference in
  ctypes.set_conversion_mode(). Patch by Xiang Zhang.

- bpo-28284: Strengthen resistance of ``_json.encode_basestring_ascii()`` to
  integer overflow.

- bpo-27611: Fixed support of default root window in the Tix module.

- bpo-24363: When parsing HTTP header fields, if an invalid line is
  encountered, skip it and continue parsing.  Previously, no more header
  fields were parsed, which could lead to fields for HTTP framing like
  Content-Length and Transfer-Encoding being overlooked.

- bpo-27599: Fixed buffer overrun in binascii.b2a_qp() and
  binascii.a2b_qp().

- bpo-25969: Update the lib2to3 grammar to handle the unpacking
  generalizations added in 3.5.

- bpo-24594: Validates persist parameter when opening MSI database

- bpo-27570: Avoid zero-length memcpy() etc calls with null source pointers
  in the "ctypes" and "array" modules.

- bpo-22450: urllib now includes an "Accept: */*" header among the default
  headers.  This makes the results of REST API requests more consistent and
  predictable especially when proxy servers are involved.

- lib2to3.pgen3.driver.load_grammar() now creates a stable cache file
  between runs given the same Grammar.txt input regardless of the hash
  randomization setting.

- bpo-27691: Fix ssl module's parsing of GEN_RID subject alternative name
  fields in X.509 certs.

- bpo-27850: Remove 3DES from ssl module's default cipher list to counter
  measure sweet32 attack (CVE-2016-2183).

- bpo-27766: Add ChaCha20 Poly1305 to ssl module's default ciper list.
  (Required OpenSSL 1.1.0 or LibreSSL).

- bpo-26470: Port ssl and hashlib module to OpenSSL 1.1.0.

- bpo-27944: Fix some memory-corruption bugs in the log reading code of the
  _hotshot module.

- bpo-27934: Use ``float.__repr__`` instead of plain ``repr`` when JSON-
  encoding an instance of a float subclass. Thanks Eddie James.

- bpo-27861: Fixed a crash in sqlite3.Connection.cursor() when a factory
  creates not a cursor.  Patch by Xiang Zhang.

- bpo-19884: Avoid spurious output on OS X with Gnu Readline.

- bpo-10513: Fix a regression in Connection.commit().  Statements should not
  be reset after a commit.

- bpo-2466: posixpath.ismount now correctly recognizes mount points which
  the user does not have permission to access.

- bpo-27783: Fix possible usage of uninitialized memory in
  operator.methodcaller.

- bpo-27774: Fix possible Py_DECREF on unowned object in _sre.

- bpo-27760: Fix possible integer overflow in binascii.b2a_qp.

- In the curses module, raise an error if window.getstr() or window.instr()
  is passed a negative value.

- bpo-27758: Fix possible integer overflow in the _csv module for large
  record lengths.

- bpo-23369: Fixed possible integer overflow in
  _json.encode_basestring_ascii.

- bpo-27568: Prevent HTTPoxy attack (CVE-2016-1000110). Ignore the
  HTTP_PROXY variable when REQUEST_METHOD environment is set, which
  indicates that the script is in CGI mode.

- bpo-27130: In the "zlib" module, fix handling of large buffers (typically
  2 or 4 GiB). Previously, inputs were limited to 2 GiB, and compression and
  decompression operations did not properly handle results of 2 or 4 GiB.

- bpo-23804: Fix SSL zero-length recv() calls to not block and not raise an
  error about unclean EOF.

- bpo-27466: Change time format returned by http.cookie.time2netscape,
  confirming the netscape cookie format and making it consistent with
  documentation.

- bpo-22115: Fixed tracing Tkinter variables: trace_vdelete() with wrong
  mode no longer break tracing, trace_vinfo() now always returns a list of
  pairs of strings.

- bpo-27079: Fixed curses.ascii functions isblank(), iscntrl() and
  ispunct().

- bpo-22636: Avoid shell injection problems with ctypes.util.find_library().

- bpo-27330: Fixed possible leaks in the ctypes module.

- bpo-27238: Got rid of bare excepts in the turtle module.  Original patch
  by Jelle Zijlstra.

- bpo-26386: Fixed ttk.TreeView selection operations with item id's
  containing spaces.

- bpo-25455: Fixed a crash in repr of cElementTree.Element with recursive
  tag.

- bpo-21201: Improves readability of multiprocessing error message.  Thanks
  to Wojciech Walczak for patch.

IDLE
----

- bpo-27854: Make Help => IDLE Help work again on Windows. Include
  idlelib/help.html in 2.7 Windows installer.

- bpo-25507: Add back import needed for 2.x encoding warning box. Add
  pointer to 'Encoding declaration' in Language Reference.

- bpo-15308: Add 'interrupt execution' (^C) to Shell menu. Patch by Roger
  Serwy, updated by Bayard Randel.

- bpo-27922: Stop IDLE tests from 'flashing' gui widgets on the screen.

- bpo-17642: add larger font sizes for classroom projection.

- Add version to title of IDLE help window.

- bpo-25564: In section on IDLE -- console differences, mention that using
  exec means that __builtins__ is defined for each statement.

- bpo-27714: text_textview and test_autocomplete now pass when re-run in the
  same process.  This occurs when test_idle fails when run with the -w
  option but without -jn.  Fix warning from test_config.

- bpo-27452: add line counter and crc to IDLE configHandler test dump.

- bpo-27365: Allow non-ascii chars in IDLE NEWS.txt, for contributor names.

- bpo-27245: IDLE: Cleanly delete custom themes and key bindings.
  Previously, when IDLE was started from a console or by import, a cascade
  of warnings was emitted. Patch by Serhiy Storchaka.

Documentation
-------------

- bpo-28513: Documented command-line interface of zipfile.

- bpo-16484: Change the default PYTHONDOCS URL to "https:", and fix the
  resulting links to use lowercase.  Patch by Sean Rodman, test by Kaushik
  Nadikuditi.

Tests
-----

- bpo-28666: Now test.test_support.rmtree is able to remove unwritable or
  unreadable directories.

- bpo-23839: Various caches now are cleared before running every test file.

- bpo-27369: In test_pyexpat, avoid testing an error message detail that
  changed in Expat 2.2.0.

Build
-----

- bpo-10656: Fix out-of-tree building on AIX.  Patch by Tristan Carel and
  Michael Haubenwallner.

- bpo-26359: Rename --with-optimiations to --enable-optimizations.

- bpo-28248: Update Windows build and OS X installers to use OpenSSL 1.0.2j.

- bpo-28258: Fixed build with Estonian locale (distclean target in
  Makefile).  Patch by Arfrever Frehtes Taifersar Arahesis.

- bpo-26661: setup.py now detects system libffi with multiarch wrapper.

- bpo-15819: The Include directory in the build tree is already searched;
  drop unused code trying to add it again.

- bpo-27566: Fix clean target in freeze makefile (patch by Lisa Roach)

- bpo-27983: Cause lack of llvm-profdata tool when using clang as required
  for PGO linking to be a configure time error rather than make time when
  ``--with-optimizations`` is enabled.  Also improve our ability to find the
  llvm-profdata tool on MacOS and some Linuxes.

- bpo-26359: Add the --with-optimizations configure flag.

- bpo-10910: Avoid C++ compilation errors on FreeBSD and OS X. Also update
  FreedBSD version checks for the original ctype UTF-8 workaround.

- bpo-27806: Fix 32-bit builds on macOS Sierra 10.12 broken by removal of
  deprecated QuickTime/QuickTime.h header file.  Patch by Aleks Bunin.

- bpo-28676: Prevent missing 'getentropy' declaration warning on macOS.
  Initial patch by Gareth Rees.

Tools/Demos
-----------

- bpo-27952: Get Tools/scripts/fixcid.py working with the current "re"
  module, avoid invalid Python backslash escapes, and fix a bug parsing
  escaped C quote signs.

Windows
-------

- bpo-27932: Prevent memory leak in win32_ver().

- bpo-27888: Prevent Windows installer from displaying console windows and
  failing when pip cannot be installed/uninstalled.

macOS
-----

- bpo-28440: No longer add /Library/Python/site-packages, the Apple-supplied
  system Python site-packages directory, to sys.path for macOS framework
  builds. The coupling between the two Python instances often caused
  confusion and, as of macOS 10.12, changes to the site-packages layout can
  cause pip component installations to fail.  This change reverts the
  effects introduced in 2.7.0 by Issue #4865.  If you are using a package
  with both the Apple system Python 2.7 and a user-installed Python 2.7, you
  will need to ensure that copies of the package are installed with both
  Python instances.


What's New in Python 2.7.12 final?
==================================

*Release date: 2016-06-25*

Build
-----

- bpo-27641: The configure script now inserts comments into the makefile to
  prevent the pgen executable from being cross-compiled.

- bpo-26930: Update Windows builds to use OpenSSL 1.0.2h.

IDLE
----

- bpo-27365: Fix about dialog.


What's New in Python 2.7.12 release candidate 1?
================================================

*Release date: 2016-06-12*

Core and Builtins
-----------------

- bpo-20041: Fixed TypeError when frame.f_trace is set to None. Patch by
  Xavier de Gaye.

- bpo-25702: A --with-lto configure option has been added that will enable
  link time optimizations at build time during a make profile-opt. Some
  compilers and toolchains are known to not produce stable code when using
  LTO, be sure to test things thoroughly before relying on it. It can
  provide a few % speed up over profile-opt alone.

- bpo-26168: Fixed possible refleaks in failing Py_BuildValue() with the "N"
  format unit.

- bpo-27039: Fixed bytearray.remove() for values greater than 127.  Patch by
  Joe Jevnik.

- bpo-4806: Avoid masking the original TypeError exception when using star
  (*) unpacking and the exception was raised from a generator.  Based on
  patch by Hagen Fürstenau.

- bpo-26659: Make the builtin slice type support cycle collection.

- bpo-26718: super.__init__ no longer leaks memory if called multiple times.
  NOTE: A direct call of super.__init__ is not endorsed!

- bpo-13410: Fixed a bug in PyUnicode_Format where it failed to properly
  ignore errors from a __int__() method.

- bpo-26494: Fixed crash on iterating exhausting iterators. Affected classes
  are generic sequence iterators, iterators of bytearray, list, tuple, set,
  frozenset, dict, OrderedDict and corresponding views.

- bpo-26581: If coding cookie is specified multiple times on a line in
  Python source code file, only the first one is taken to account.

- bpo-22836: Ensure exception reports from PyErr_Display() and
  PyErr_WriteUnraisable() are sensible even when formatting them produces
  secondary errors.  This affects the reports produced by
  sys.__excepthook__() and when __del__() raises an exception.

- bpo-22847: Improve method cache efficiency.

- bpo-25843: When compiling code, don't merge constants if they are equal
  but have a different types. For example, ``f1, f2 = lambda: 1, lambda:
  1.0`` is now correctly compiled to two different functions: ``f1()``
  returns ``1`` (``int``) and ``f2()`` returns ``1.0`` (``int``), even if
  ``1`` and ``1.0`` are equal.

- bpo-22995: [UPDATE] Remove the one of the pickleability tests in
  _PyObject_GetState() due to regressions observed in Cython-based projects.

- bpo-25961: Disallowed null characters in the type name.

- bpo-22995: Instances of extension types with a state that aren't
  subclasses of list or dict and haven't implemented any pickle-related
  methods (__reduce__, __reduce_ex__, __getnewargs__, __getnewargs_ex__, or
  __getstate__), can no longer be pickled.  Including memoryview.

- bpo-20440: Massive replacing unsafe attribute setting code with special
  macro Py_SETREF.

- bpo-25421: __sizeof__ methods of builtin types now use dynamic basic size.
  This allows sys.getsize() to work correctly with their subclasses with
  __slots__ defined.

- bpo-19543: Added Py3k warning for decoding unicode.

- bpo-24097: Fixed crash in object.__reduce__() if slot name is freed inside
  __getattr__.

- bpo-24731: Fixed crash on converting objects with special methods __str__,
  __trunc__, and __float__ returning instances of subclasses of str, long,
  and float to subclasses of str, long, and float correspondingly.

- bpo-26478: Fix semantic bugs when using binary operators with dictionary
  views and tuples.

- bpo-26171: Fix possible integer overflow and heap corruption in
  zipimporter.get_data().

Library
-------

- bpo-26556: Update expat to 2.1.1, fixes CVE-2015-1283.

- Fix TLS stripping vulnerability in smptlib, CVE-2016-0772.  Reported by
  Team Oststrom

- bpo-7356: ctypes.util: Make parsing of ldconfig output independent of the
  locale.

- bpo-25738: Stop BaseHTTPServer.BaseHTTPRequestHandler.send_error() from
  sending a message body for 205 Reset Content.  Also, don't send the
  Content-Type header field in responses that don't have a body.  Based on
  patch by Susumu Koshiba.

- bpo-21313: Fix the "platform" module to tolerate when sys.version contains
  truncated build information.

- bpo-27211: Fix possible memory corruption in io.IOBase.readline().

- bpo-27114: Fix SSLContext._load_windows_store_certs fails with
  PermissionError

- bpo-14132: Fix urllib.request redirect handling when the target only has a
  query string.  Fix by Ján Janech.

- Removed the requirements for the ctypes and modulefinder modules to be
  compatible with earlier Python versions.

- bpo-22274: In the subprocess module, allow stderr to be redirected to
  stdout even when stdout is not redirected.  Patch by Akira Li.

- bpo-12045: Avoid duplicate execution of command in
  ctypes.util._get_soname(). Patch by Sijin Joseph.

- bpo-26960: Backported #16270 from Python 3 to Python 2, to prevent urllib
  from hanging when retrieving certain FTP files.

- bpo-25745: Fixed leaking a userptr in curses panel destructor.

- bpo-17765: weakref.ref() no longer silently ignores keyword arguments.
  Patch by Georg Brandl.

- bpo-26873: xmlrpclib now raises ResponseError on unsupported type tags
  instead of silently return incorrect result.

- bpo-24114: Fix an uninitialized variable in `ctypes.util`.

  The bug only occurs on SunOS when the ctypes implementation searches for
  the `crle` program.  Patch by Xiang Zhang.  Tested on SunOS by Kees Bos.

- bpo-26864: In urllib, change the proxy bypass host checking against
  no_proxy to be case-insensitive, and to not match unrelated host names
  that happen to have a bypassed hostname as a suffix.  Patch by Xiang
  Zhang.

- bpo-26804: urllib will prefer lower_case proxy environment variables over
  UPPER_CASE or Mixed_Case ones. Patch contributed by Hans-Peter Jansen.

- bpo-26837: assertSequenceEqual() now correctly outputs non-stringified
  differing items. This affects assertListEqual() and assertTupleEqual().

- bpo-26822: itemgetter, attrgetter and methodcaller objects no longer
  silently ignore keyword arguments.

- bpo-26657: Fix directory traversal vulnerability with SimpleHTTPServer on
  Windows. This fixes a regression that was introduced in 2.7.7.  Based on
  patch by Philipp Hagemeister.

- bpo-19377: Add .svg to mimetypes.types_map.

- bpo-13952: Add .csv to mimetypes.types_map.  Patch by Geoff Wilson.

- bpo-16329: Add .webm to mimetypes.types_map.  Patch by Giampaolo Rodola'.

- bpo-23735: Handle terminal resizing with Readline 6.3+ by installing our
  own SIGWINCH handler.  Patch by Eric Price.

- bpo-26644: Raise ValueError rather than SystemError when a negative length
  is passed to SSLSocket.recv() or read().

- bpo-23804: Fix SSL recv(0) and read(0) methods to return zero bytes
  instead of up to 1024.

- bpo-24266: Ctrl+C during Readline history search now cancels the search
  mode when compiled with Readline 7.

- bpo-23857: Implement PEP 493, adding a Python-2-only ssl module API and
  environment variable to configure the default handling of SSL/TLS
  certificates for HTTPS connections.

- bpo-26313: ssl.py _load_windows_store_certs fails if windows cert store is
  empty. Patch by Baji.

- bpo-26513: Fixes platform module detection of Windows Server

- bpo-23718: Fixed parsing time in week 0 before Jan 1.  Original patch by
  Tamás Bence Gedai.

- bpo-26177: Fixed the keys() method for Canvas and Scrollbar widgets.

- bpo-15068: Got rid of excessive buffering in the fileinput module. The
  bufsize parameter is no longer used.

- bpo-2202: Fix UnboundLocalError in
  AbstractDigestAuthHandler.get_algorithm_impls. Initial patch by Mathieu
  Dupuy.

- bpo-26475: Fixed debugging output for regular expressions with the (?x)
  flag.

- bpo-26385: Remove the file if the internal fdopen() call in
  NamedTemporaryFile() fails. Based on patch by Silent Ghost.

- bpo-26309: In the "SocketServer" module, shut down the request (closing
  the connected socket) when verify_request() returns false.  Based on patch
  by Aviv Palivoda.

- bpo-25939: On Windows open the cert store readonly in
  ssl.enum_certificates.

- bpo-24303: Fix random EEXIST upon multiprocessing semaphores creation with
  Linux PID namespaces enabled.

- bpo-25698: Importing module if the stack is too deep no longer replaces
  imported module with the empty one.

- bpo-12923: Reset FancyURLopener's redirect counter even if there is an
  exception. Based on patches by Brian Brazil and Daniel Rocco.

- bpo-25945: Fixed a crash when unpickle the functools.partial object with
  wrong state. Fixed a leak in failed functools.partial constructor. "args"
  and "keywords" attributes of functools.partial have now always types tuple
  and dict correspondingly.

- bpo-19883: Fixed possible integer overflows in zipimport.

- bpo-26147: xmlrpclib now works with unicode not encodable with used
  non-UTF-8 encoding.

- bpo-16620: Fixed AttributeError in msilib.Directory.glob().

- bpo-21847: Fixed xmlrpclib on Unicode-disabled builds.

- bpo-6500: Fixed infinite recursion in urllib2.Request.__getattr__().

- bpo-26083: Workaround a subprocess bug that raises an incorrect
  "ValueError: insecure string pickle" exception instead of the actual
  exception on some platforms such as Mac OS X when an exception raised in
  the forked child process prior to the exec() was large enough that it
  overflowed the internal errpipe_read pipe buffer.

- bpo-24103: Fixed possible use after free in ElementTree.iterparse().

- bpo-20954: _args_from_interpreter_flags used by multiprocessing and some
  tests no longer behaves incorrectly in the presence of the PYTHONHASHSEED
  environment variable.

- bpo-14285: When executing a package with the "python -m package" option,
  and package initialization raises ImportError, a proper traceback is now
  reported.

- bpo-6478: _strptime's regexp cache now is reset after changing timezone
  with time.tzset().

- bpo-25718: Fixed copying object with state with boolean value is false.

- bpo-25742: :func:`locale.setlocale` now accepts a Unicode string for its
  second parameter.

- bpo-10131: Fixed deep copying of minidom documents.  Based on patch by
  Marian Ganisin.

- bpo-25725: Fixed a reference leak in cPickle.loads() when unpickling
  invalid data including tuple instructions.

- bpo-25663: In the Readline completer, avoid listing duplicate global
  names, and search the global namespace before searching builtins.

- bpo-25688: Fixed file leak in ElementTree.iterparse() raising an error.

- bpo-23914: Fixed SystemError raised by CPickle unpickler on broken data.

- bpo-25924: Avoid unnecessary serialization of getaddrinfo(3) calls on OS X
  versions 10.5 or higher.  Original patch by A. Jesse Jiryu Davis.

- bpo-26406: Avoid unnecessary serialization of getaddrinfo(3) calls on
  current versions of OpenBSD and NetBSD.  Patch by A. Jesse Jiryu Davis.

IDLE
----

- bpo-5124: Paste with text selected now replaces the selection on X11. This
  matches how paste works on Windows, Mac, most modern Linux apps, and ttk
  widgets. Original patch by Serhiy Storchaka.

- bpo-24759: Make clear in idlelib.idle_test.__init__ that the directory is
  a private implementation of test.test_idle and tool for maintainers.

- bpo-26673: When tk reports font size as 0, change to size 10. Such fonts
  on Linux prevented the configuration dialog from opening.

- bpo-27044: Add ConfigDialog.remove_var_callbacks to stop memory leaks.

- In the 'IDLE-console differences' section of the IDLE doc, clarify how
  running with IDLE affects sys.modules and the standard streams.

- bpo-25507: fix incorrect change in IOBinding that prevented printing.
  Change also prevented saving shell window with non-ascii characters.
  Augment IOBinding htest to include all major IOBinding functions.

- bpo-25905: Revert unwanted conversion of ' to ’ RIGHT SINGLE QUOTATION
  MARK in README.txt and open this and NEWS.txt with 'ascii'. Re-encode
  CREDITS.txt to utf-8 and open it with 'utf-8'.

- bpo-26417: Prevent spurious errors and incorrect defaults when installing
  IDLE 2.7 on OS X: default configuration settings are no longer installed
  from OS X specific copies.

Documentation
-------------

- bpo-26736: Used HTTPS for external links in the documentation if possible.

- bpo-6953: Rework the Readline module documentation to group related
  functions together, and add more details such as what underlying Readline
  functions and variables are accessed.

- bpo-26014: Guide users to the newer packaging documentation as was done
  for Python 3.x. In particular, the top-level 2.7 documentation page now
  links to the newer installer and distributions pages rather than the
  legacy install and Distutils pages; these are still linked to in the
  library/distutils doc page.

Tests
-----

- bpo-21916: Added tests for the turtle module.  Patch by ingrid, Gregory
  Loyse and Jelle Zijlstra.

- bpo-25940: Changed test_ssl to use self-signed.pythontest.net.  This
  avoids relying on svn.python.org, which recently changed root certificate.

- bpo-25616: Tests for OrderedDict are extracted from test_collections into
  separate file test_ordered_dict.

Build
-----

- bpo-22359: Avoid incorrect recursive $(MAKE), and disable the rules for
  running pgen when cross-compiling.  The pgen output is normally saved with
  the source code anyway, and is still regenerated when doing a native
  build. Patch by Jonas Wagner and Xavier de Gaye.

- bpo-19450: Update Windows builds to use SQLite 3.8.11.0.

- bpo-27229: Fix the cross-compiling pgen rule for in-tree builds.  Patch by
  Xavier de Gaye.

- bpo-17603: Avoid error about nonexistant fileblocks.o file by using a
  lower-level check for st_blocks in struct stat.

- bpo-26465: Update Windows builds to use OpenSSL 1.0.2g.

- bpo-24421: Compile Modules/_math.c once, before building extensions.
  Previously it could fail to compile properly if the math and cmath builds
  were concurrent.

- bpo-25824: Fixes sys.winver to not include any architecture suffix.

- bpo-25348: Added ``--pgo`` and ``--pgo-job`` arguments to
  ``PCbuild\build.bat`` for building with Profile-Guided Optimization.  The
  old ``PCbuild\build_pgo.bat`` script is now deprecated, and simply calls
  ``PCbuild\build.bat --pgo %*``.

- bpo-25827: Add support for building with ICC to ``configure``, including a
  new ``--with-icc`` flag.

- bpo-25696: Fix installation of Python on UNIX with make -j9.

- bpo-26930: Update OS X 10.5+ 32-bit-only installer to build and link with
  OpenSSL 1.0.2h.

- bpo-26268: Update Windows builds to use OpenSSL 1.0.2f.

- bpo-25136: Support Apple Xcode 7's new textual SDK stub libraries.

Tools/Demos
-----------

- bpo-26799: Fix python-gdb.py: don't get C types once when the Python code
  is loaded, but get C types on demand. The C types can change if
  python-gdb.py is loaded before the Python executable. Patch written by
  Thomas Ilsche.

C API
-----

- bpo-30255: PySlice_GetIndicesEx now clips the step to [-PY_SSIZE_T_MAX,
  PY_SSIZE_T_MAX] instead of [-PY_SSIZE_T_MAX-1, PY_SSIZE_T_MAX].  This
  makes it safe to do "step = -step" when reversing a slice.

- bpo-26476: Fixed compilation error when use PyErr_BadInternalCall() in
  C++. Patch by Jeroen Demeyer.

Windows
-------

- bpo-17500: Remove unused and outdated icons. (See also:
  https://github.com/python/pythondotorg/issues/945)


What's New in Python 2.7.11 final?
==================================

*Release date: 2015-12-05*

Library
-------

- bpo-25624: ZipFile now always writes a ZIP_STORED header for directory
  entries.  Patch by Dingyuan Wang.


What's New in Python 2.7.11 release candidate 1?
================================================

*Release date: 2015-11-21*

Core and Builtins
-----------------

- bpo-25678: Avoid buffer overreads when int(), long(), float(), and
  compile() are passed buffer objects.  These objects are not necessarily
  terminated by a null byte, but the functions assumed they were.

- bpo-25388: Fixed tokenizer hang when processing undecodable source code
  with a null byte.

- bpo-22995: Default implementation of __reduce__ and __reduce_ex__ now
  rejects builtin types with not defined __new__.

- bpo-7267: format(int, 'c') now raises OverflowError when the argument is
  not in range(0, 256).

- bpo-24806: Prevent builtin types that are not allowed to be subclassed
  from being subclassed through multiple inheritance.

- bpo-24848: Fixed a number of bugs in UTF-7 decoding of misformed data.

- bpo-25003: os.urandom() doesn't use getentropy() on Solaris because
  getentropy() is blocking, whereas os.urandom() should not block.
  getentropy() is supported since Solaris 11.3.

- bpo-21167: NAN operations are now handled correctly when python is
  compiled with ICC even if -fp-model strict is not specified.

- bpo-24467: Fixed possible buffer over-read in bytearray. The bytearray
  object now always allocates place for trailing null byte and it's buffer
  now is always null-terminated.

- bpo-19543: encode() and decode() methods and constructors of str, unicode
  and bytearray classes now emit deprecation warning for known non-text
  encodings when Python is ran with the -3 option.

- bpo-24115: Update uses of PyObject_IsTrue(), PyObject_Not(),
  PyObject_IsInstance(), PyObject_RichCompareBool() and _PyDict_Contains()
  to check for and handle errors correctly.

- bpo-4753: On compilers where it is supported, use "computed gotos" for
  bytecode dispatch in the interpreter. This improves interpretation
  performance.

- bpo-22939: Fixed integer overflow in iterator object.  Original patch by
  Clement Rouault.

- bpo-24102: Fixed exception type checking in standard error handlers.

Library
-------

- bpo-10128: backport issue #10845's mitigation of incompatibilities between
  the multiprocessing module and directory and zipfile execution.
  Multiprocessing on Windows will now automatically skip rerunning __main__
  in spawned processes, rather than failing with AssertionError.

- bpo-25578: Fix (another) memory leak in SSLSocket.getpeercer().

- bpo-25590: In the Readline completer, only call getattr() once per
  attribute.

- bpo-25530: Disable the vulnerable SSLv3 protocol by default when creating
  ssl.SSLContext.

- bpo-25569: Fix memory leak in SSLSocket.getpeercert().

- bpo-7759: Fixed the mhlib module on filesystems that doesn't support link
  counting for directories.

- bpo-892902: Fixed pickling recursive objects.

- bpo-18010: Fix the pydoc GUI's search function to handle exceptions from
  importing packages.

- bpo-25515: Always use os.urandom as a source of randomness in uuid.uuid4.

- bpo-21827: Fixed textwrap.dedent() for the case when largest common
  whitespace is a substring of smallest leading whitespace. Based on patch
  by Robert Li.

- bpo-21709: Fix the logging module to not depend upon __file__ being set
  properly to get the filename of its caller from the stack.  This allows it
  to work if run in a frozen or embedded environment where the module's
  .__file__ attribute does not match its code object's .co_filename.

- bpo-25319: When threading.Event is reinitialized, the underlying condition
  should use a regular lock rather than a recursive lock.

- bpo-25232: Fix CGIRequestHandler to split the query from the URL at the
  first question mark (?) rather than the last. Patch from Xiang Zhang.

- bpo-24657: Prevent CGIRequestHandler from collapsing slashes in the query
  part of the URL as if it were a path. Patch from Xiang Zhang.

- bpo-22958: Constructor and update method of weakref.WeakValueDictionary
  now accept the self keyword argument.

- bpo-22609: Constructor and the update method of collections.UserDict now
  accept the self keyword argument.

- bpo-25203: Failed readline.set_completer_delims() no longer left the
  module in inconsistent state.

- bpo-19143: platform module now reads Windows version from kernel32.dll to
  avoid compatibility shims.

- bpo-25135: Make deque_clear() safer by emptying the deque before clearing.
  This helps avoid possible reentrancy issues.

- bpo-24684: socket.socket.getaddrinfo() now calls
  PyUnicode_AsEncodedString() instead of calling the encode() method of the
  host, to handle correctly custom unicode string with an encode() method
  which doesn't return a byte string. The encoder of the IDNA codec is now
  called directly instead of calling the encode() method of the string.

- bpo-24982: shutil.make_archive() with the "zip" format now adds entries
  for directories (including empty directories) in ZIP file.

- bpo-17849: Raise a sensible exception if an invalid response is received
  for a HTTP tunnel request, as seen with some servers that do not support
  tunnelling. Initial patch from Cory Benfield.

- bpo-16180: Exit pdb if file has syntax error, instead of trapping user in
  an infinite loop.  Patch by Xavier de Gaye.

- bpo-22812: Fix unittest discovery examples. Patch from Pam McA'Nulty.

- bpo-24634: Importing uuid should not try to load libc on Windows

- bpo-23652: Make it possible to compile the select module against the libc
  headers from the Linux Standard Base, which do not include some EPOLL
  macros.  Initial patch by Matt Frank.

- bpo-15138: Speed up base64.urlsafe_b64{en,de}code considerably.

- bpo-23319: Fix ctypes.BigEndianStructure, swap correctly bytes. Patch
  written by Matthieu Gautier.

- bpo-23254: Document how to close the TCPServer listening socket. Patch
  from Martin Panter.

- bpo-17527: Add PATCH to wsgiref.validator. Patch from Luca Sbardella.

- bpo-24613: Calling array.fromstring() with self is no longer allowed to
  prevent the use-after-free error.  Patch by John Leitch.

- bpo-24708: Fix possible integer overflow in strop.replace().

- bpo-24620: Random.setstate() now validates the value of state last
  element.

- bpo-13938: 2to3 converts StringTypes to a tuple. Patch from Mark Hammond.

- bpo-24611: Fixed compiling the posix module on non-Windows platforms
  without mknod() or makedev() (e.g. on Unixware).

- bpo-18684: Fixed reading out of the buffer in the re module.

- bpo-24259: tarfile now raises a ReadError if an archive is truncated
  inside a data segment.

- bpo-24514: tarfile now tolerates number fields consisting of only
  whitespace.

- bpo-20387: Restore semantic round-trip correctness in tokenize/untokenize
  for tab-indented blocks.

- bpo-24456: Fixed possible buffer over-read in adpcm2lin() and lin2adpcm()
  functions of the audioop module.  Fixed SystemError when the state is not
  a tuple.  Fixed possible memory leak.

- bpo-24481: Fix possible memory corruption with large profiler info strings
  in hotshot.

- bpo-24489: ensure a previously set C errno doesn't disturb cmath.polar().

- bpo-19543: io.TextIOWrapper (and hence io.open()) now uses the internal
  codec marking system added to emit deprecation warning for known non-text
  encodings at stream construction time when Python is ran with the -3
  option.

- bpo-24264: Fixed buffer overflow in the imageop module.

- bpo-5633: Fixed timeit when the statement is a string and the setup is
  not.

- bpo-24326: Fixed audioop.ratecv() with non-default weightB argument.
  Original patch by David Moore.

- bpo-22095: Fixed HTTPConnection.set_tunnel with default port.  The port
  value in the host header was set to "None".  Patch by Demian Brecht.

- bpo-24257: Fixed segmentation fault in sqlite3.Row constructor with faked
  cursor type.

- bpo-24286: Dict view were not registered with the MappingView abstract
  base classes. This caused key and item views in OrderedDict to not be
  equal to their regular dict counterparts.

- bpo-22107: tempfile.gettempdir() and tempfile.mkdtemp() now try again when
  a directory with the chosen name already exists on Windows as well as on
  Unix. tempfile.mkstemp() now fails early if parent directory is not valid
  (not exists or is a file) on Windows.

- bpo-6598: Increased time precision and random number range in
  email.utils.make_msgid() to strengthen the uniqueness of the message ID.

- bpo-24091: Fixed various crashes in corner cases in cElementTree.

- bpo-15267: HTTPConnection.request() now is compatible with old-style
  classes (such as TemporaryFile).  Original patch by Atsuo Ishimoto.

- bpo-20014: array.array() now accepts unicode typecodes.  Based on patch by
  Vajrasky Kok.

- bpo-23637: Showing a warning no longer fails with UnicodeError. Formatting
  unicode warning in the file with the path containing non-ascii characters
  no longer fails with UnicodeError.

- bpo-24134: Reverted issue #24134 changes.

IDLE
----

- bpo-15348: Stop the debugger engine (normally in a user process) before
  closing the debugger window (running in the IDLE process). This prevents
  the RuntimeErrors that were being caught and ignored.

- bpo-24455: Prevent IDLE from hanging when a) closing the shell while the
  debugger is active (15347); b) closing the debugger with the [X] button
  (15348); and c) activating the debugger when already active (24455). The
  patch by Mark Roseman does this by making two changes. 1. Suspend and
  resume the gui.interaction method with the tcl vwait mechanism intended
  for this purpose (instead of root.mainloop & .quit). 2. In gui.run, allow
  any existing interaction to terminate first.

- Change 'The program' to 'Your program' in an IDLE 'kill program?' message
  to make it clearer that the program referred to is the currently running
  user program, not IDLE itself.

- bpo-24750: Improve the appearance of the IDLE editor window status bar.
  Patch by Mark Roseman.

- bpo-25313: Change the handling of new built-in text color themes to better
  address the compatibility problem introduced by the addition of IDLE Dark.
  Consistently use the revised idleConf.CurrentTheme everywhere in idlelib.

- bpo-24782: Extension configuration is now a tab in the IDLE Preferences
  dialog rather than a separate dialog.   The former tabs are now a sorted
  list.  Patch by Mark Roseman.

- bpo-22726: Re-activate the config dialog help button with some content
  about the other buttons and the new IDLE Dark theme.

- bpo-24820: IDLE now has an 'IDLE Dark' built-in text color theme. It is
  more or less IDLE Classic inverted, with a cobalt blue background.
  Strings, comments, keywords, ... are still green, red, orange, ... . To
  use it with IDLEs released before November 2015, hit the 'Save as New
  Custom Theme' button and enter a new name, such as 'Custom Dark'.  The
  custom theme will work with any IDLE release, and can be modified.

- bpo-25224: README.txt is now an idlelib index for IDLE developers and
  curious users. The previous user content is now in the IDLE doc chapter.
  'IDLE' now means 'Integrated Development and Learning Environment'.

- bpo-24820: Users can now set breakpoint colors in Settings -> Custom
  Highlighting. Original patch by Mark Roseman.

- bpo-24972: Inactive selection background now matches active selection
  background, as configured by users, on all systems.  Found items are now
  always highlighted on Windows.  Initial patch by Mark Roseman.

- bpo-24570: Idle: make calltip and completion boxes appear on Macs affected
  by a tk regression.  Initial patch by Mark Roseman.

- bpo-24988: Idle ScrolledList context menus (used in debugger) now work on
  Mac Aqua. Patch by Mark Roseman.

- bpo-24801: Make right-click for context menu work on Mac Aqua. Patch by
  Mark Roseman.

- bpo-25173: Associate tkinter messageboxes with a specific widget. For Mac
  OSX, make them a 'sheet'.  Patch by Mark Roseman.

- bpo-25198: Enhance the initial html viewer now used for Idle Help. *
  Properly indent fixed-pitch text (patch by Mark Roseman). * Give code
  snippet a very Sphinx-like light blueish-gray background. * Re-use initial
  width and height set by users for shell and editor. * When the Table of
  Contents (TOC) menu is used, put the section header at the top of the
  screen.

- bpo-25225: Condense and rewrite Idle doc section on text colors.

- bpo-21995: Explain some differences between IDLE and console Python.

- bpo-22820: Explain need for *print* when running file from Idle editor.

- bpo-25224: Doc: augment Idle feature list and no-subprocess section.

- bpo-25219: Update doc for Idle command line options. Some were missing and
  notes were not correct.

- bpo-24861: Most of idlelib is private and subject to change. Use
  idleib.idle.* to start Idle. See idlelib.__init__.__doc__.

- bpo-25199: Idle: add synchronization comments for future maintainers.

- bpo-16893: Replace help.txt with help.html for Idle doc display. The new
  idlelib/help.html is rstripped Doc/build/html/library/idle.html. It looks
  better than help.txt and will better document Idle as released. The
  tkinter html viewer that works for this file was written by Mark Roseman.
  The now unused EditorWindow.HelpDialog class and helt.txt file are
  deprecated.

- bpo-24199: Deprecate unused idlelib.idlever with possible removal in 3.6.

- bpo-24790: Remove extraneous code (which also create 2 & 3 conflicts).

- bpo-23672: Allow Idle to edit and run files with astral chars in name.
  Patch by Mohd Sanad Zaki Rizvi.

- bpo-24745: Idle editor default font. Switch from Courier to
  platform-sensitive TkFixedFont.  This should not affect current customized
  font selections.  If there is a problem, edit
  $HOME/.idlerc/config-main.cfg and remove 'fontxxx' entries from [Editor
  Window].  Patch by Mark Roseman.

- bpo-21192: Idle editor. When a file is run, put its name in the restart
  bar. Do not print false prompts. Original patch by Adnan Umer.

- bpo-13884: Idle menus. Remove tearoff lines. Patch by Roger Serwy.

- bpo-15809: IDLE shell now uses locale encoding instead of Latin1 for
  decoding unicode literals.

Documentation
-------------

- bpo-24952: Clarify the default size argument of stack_size() in the
  "threading" and "thread" modules. Patch from Mattip.

- bpo-20769: Improve reload() docs. Patch by Dorian Pula.

- bpo-23589: Remove duplicate sentence from the FAQ.  Patch by Yongzhi Pan.

- bpo-22155: Add File Handlers subsection with createfilehandler to Tkinter
  doc.  Remove obsolete example from FAQ.  Patch by Martin Panter.

Tests
-----

- bpo-24751: When running regrtest with the ``-w`` command line option, a
  test run is no longer marked as a failure if all tests succeed when
  re-run.

- PCbuild\rt.bat now accepts an unlimited number of arguments to pass along
  to regrtest.py.  Previously there was a limit of 9.

Build
-----

- bpo-24915: When doing a PGO build, the test suite is now used instead of
  pybench; Clang support was also added as part off this work. Initial patch
  by Alecsandru Patrascu of Intel.

- bpo-24986: It is now possible to build Python on Windows without errors
  when external libraries are not available.

- bpo-24508: Backported the MSBuild project files from Python 3.5.  The
  backported files replace the old project files in PCbuild; the old files
  moved to PC/VS9.0 and remain supported.

- bpo-24603: Update Windows builds and OS X 10.5 installer to use OpenSSL
  1.0.2d.

Windows
-------

- bpo-25022: Removed very outdated PC/example_nt/ directory.


What's New in Python 2.7.10 final?
==================================

*Release date: 2015-05-23*

Library
-------

- bpo-22931: Allow '[' and ']' in cookie values.


What's New in Python 2.7.10 release candidate 1?
================================================

*Release date: 2015-05-10*

Core and Builtins
-----------------

- bpo-23971: Fix underestimated presizing in dict.fromkeys().

- bpo-23757: PySequence_Tuple() incorrectly called the concrete list API
  when the data was a list subclass.

- bpo-23629: Fix the default __sizeof__ implementation for variable-sized
  objects.

- bpo-23055: Fixed a buffer overflow in PyUnicode_FromFormatV.  Analysis and
  fix by Guido Vranken.

- bpo-23048: Fix jumping out of an infinite while loop in the pdb.

Library
-------

- The keywords attribute of functools.partial is now always a dictionary.

- bpo-20274: When calling a _sqlite.Connection, it now complains if passed
  any keyword arguments.  Previously it silently ignored them.

- bpo-20274: Remove ignored and erroneous "kwargs" parameters from three
  METH_VARARGS methods on _sqlite.Connection.

- bpo-24134: assertRaises() and assertRaisesRegexp() checks are not longer
  successful if the callable is None.

- bpo-23008: Fixed resolving attributes with boolean value is False in
  pydoc.

- bpo-24099: Fix use-after-free bug in heapq's siftup and siftdown
  functions. (See also: bpo-24100, bpo-24101)

- Backport collections.deque fixes from Python 3.5.  Prevents reentrant
  badness during deletion by deferring the decref until the container has
  been restored to a consistent state.

- bpo-23842: os.major(), os.minor() and os.makedev() now support ints again.

- bpo-23811: Add missing newline to the PyCompileError error message. Patch
  by Alex Shkop.

- bpo-17898: Fix exception in gettext.py when parsing certain plural forms.

- bpo-23865: close() methods in multiple modules now are idempotent and more
  robust at shutdown. If they need to release multiple resources, all are
  released even if errors occur.

- bpo-23881: urllib.ftpwrapper constructor now closes the socket if the FTP
  connection failed.

- bpo-15133: _tkinter.tkapp.getboolean() now supports long and Tcl_Obj and
  always returns bool.  tkinter.BooleanVar now validates input values
  (accepted bool, int, long, str, unicode, and Tcl_Obj).
  tkinter.BooleanVar.get() now always returns bool.

- bpo-23338: Fixed formatting ctypes error messages on Cygwin. Patch by
  Makoto Kato.

- bpo-16840: Tkinter now supports 64-bit integers added in Tcl 8.4 and
  arbitrary precision integers added in Tcl 8.5.

- bpo-23834: Fix socket.sendto(), use the C long type to store the result of
  sendto() instead of the C int type.

- bpo-21526: Tkinter now supports new boolean type in Tcl 8.5.

- bpo-23838: linecache now clears the cache and returns an empty result on
  MemoryError.

- bpo-23742: ntpath.expandvars() no longer loses unbalanced single quotes.

- bpo-21802: The reader in BufferedRWPair now is closed even when closing
  writer failed in BufferedRWPair.close().

- bpo-23671: string.Template now allows specifying the "self" parameter as a
  keyword argument.  string.Formatter now allows specifying the "self" and
  the "format_string" parameters as keyword arguments.

- bpo-21560: An attempt to write a data of wrong type no longer cause
  GzipFile corruption.  Original patch by Wolfgang Maier.

- bpo-23647: Increase impalib's MAXLINE to accommodate modern mailbox sizes.

- bpo-23539: If body is None, http.client.HTTPConnection.request now sets
  Content-Length to 0 for PUT, POST, and PATCH headers to avoid 411 errors
  from some web servers.

- bpo-23136: _strptime now uniformly handles all days in week 0, including
  Dec 30 of previous year.  Based on patch by Jim Carroll.

- bpo-23138: Fixed parsing cookies with absent keys or values in cookiejar.
  Patch by Demian Brecht.

- bpo-23051: multiprocessing.Pool methods imap() and imap_unordered() now
  handle exceptions raised by an iterator.  Patch by Alon Diamant and Davin
  Potts.

- bpo-22928: Disabled HTTP header injections in httplib. Original patch by
  Demian Brecht.

- bpo-23615: Module tarfile is now can be reloaded with imp.reload().

- bpo-22853: Fixed a deadlock when use multiprocessing.Queue at import time.
  Patch by Florian Finkernagel and Davin Potts.

- bpo-23476: In the ssl module, enable OpenSSL's X509_V_FLAG_TRUSTED_FIRST
  flag on certificate stores when it is available.

- bpo-23576: Avoid stalling in SSL reads when EOF has been reached in the
  SSL layer but the underlying connection hasn't been closed.

- bpo-23504: Added an __all__ to the types module.

- bpo-23458: On POSIX, the file descriptor kept open by os.urandom() is now
  set to non inheritable

- bpo-22113: struct.pack_into() now supports new buffer protocol (in
  particular accepts writable memoryview).

- bpo-814253: Warnings now are raised when group references and conditional
  group references are used in lookbehind assertions in regular expressions.
  (See also: bpo-9179)

- bpo-23215: Multibyte codecs with custom error handlers that ignores errors
  consumed too much memory and raised SystemError or MemoryError. Original
  patch by Aleksi Torhamo.

- bpo-5700: io.FileIO() called flush() after closing the file. flush() was
  not called in close() if closefd=False.

- bpo-21548: Fix pydoc.synopsis() and pydoc.apropos() on modules with empty
  docstrings. Initial patch by Yuyang Guo.

- bpo-22885: Fixed arbitrary code execution vulnerability in the dumbdbm
  module. Original patch by Claudiu Popa.

- bpo-23481: Remove RC4 from the SSL module's default cipher list.

- bpo-21849: Fixed xmlrpclib serialization of non-ASCII unicode strings in
  the multiprocessing module.

- bpo-21840: Fixed expanding unicode variables of form $var in
  posixpath.expandvars(). Fixed all os.path implementations on
  unicode-disabled builds.

- bpo-23367: Fix possible overflows in the unicodedata module.

- bpo-23363: Fix possible overflow in itertools.permutations.

- bpo-23364: Fix possible overflow in itertools.product.

- bpo-23365: Fixed possible integer overflow in
  itertools.combinations_with_replacement.

- bpo-23366: Fixed possible integer overflow in itertools.combinations.

- bpo-23191: fnmatch functions that use caching are now threadsafe.

- bpo-18518: timeit now rejects statements which can't be compiled outside a
  function or a loop (e.g. "return" or "break").

- bpo-19996: Make :mod:`httplib` ignore headers with no name rather than
  assuming the body has started.

- bpo-20188: Support Application-Layer Protocol Negotiation (ALPN) in the
  ssl module.

- bpo-23248: Update ssl error codes from latest OpenSSL git master.

- bpo-23098: 64-bit dev_t is now supported in the os module.

- bpo-23063: In the disutils' check command, fix parsing of reST with code
  or code-block directives.

- bpo-21356: Make ssl.RAND_egd() optional to support LibreSSL. The
  availability of the function is checked during the compilation. Patch
  written by Bernard Spil.

- Backport the context argument to ftplib.FTP_TLS.

- bpo-23111: Maximize compatibility in protocol versions of ftplib.FTP_TLS.

- bpo-23112: Fix SimpleHTTPServer to correctly carry the query string and
  fragment when it redirects to add a trailing slash.

- bpo-22585: On OpenBSD 5.6 and newer, os.urandom() now calls getentropy(),
  instead of reading /dev/urandom, to get pseudo-random bytes.

- bpo-23093: In the io, module allow more operations to work on detached
  streams.

- bpo-23071: Added missing names to codecs.__all__.  Patch by Martin Panter.

- bpo-23016: A warning no longer produces an AttributeError when sys.stderr
  is None.

- bpo-21032: Fixed socket leak if HTTPConnection.getresponse() fails.
  Original patch by Martin Panter.

- bpo-22609: Constructors and update methods of mapping classes in the
  collections module now accept the self keyword argument.

Documentation
-------------

- bpo-23006: Improve the documentation and indexing of dict.__missing__. Add
  an entry in the language datamodel special methods section. Revise and
  index its discussion in the stdtypes mapping/dict section. Backport the
  code example from 3.4.

- bpo-21514: The documentation of the json module now refers to new JSON RFC
  7159 instead of obsoleted RFC 4627.

Tools/Demos
-----------

- bpo-23330: h2py now supports arbitrary filenames in #include.

- bpo-6639: Module-level turtle functions no longer raise TclError after
  closing the window.

- bpo-22314: pydoc now works when the LINES environment variable is set.

- bpo-18905: "pydoc -p 0" now outputs actually used port.  Based on patch by
  Wieland Hoffmann.

- bpo-23345: Prevent test_ssl failures with large OpenSSL patch level values
  (like 0.9.8zc).

Tests
-----

- bpo-23799: Added test.test_support.start_threads() for running and
  cleaning up multiple threads.

- bpo-22390: test.regrtest now emits a warning if temporary files or
  directories are left after running a test.

- bpo-23583: Added tests for standard IO streams in IDLE.

- bpo-23392: Added tests for marshal C API that works with FILE*.

- bpo-18982: Add tests for CLI of the calendar module.

- bpo-19949: The test_xpickle test now tests compatibility with installed
  Python 2.7 and reports skipped tests.  Based on patch by Zachary Ware.

- bpo-11578: Backported test for the timeit module.

- bpo-22943: bsddb tests are locale independend now.

IDLE
----

- bpo-23583: Fixed writing unicode to standard output stream in IDLE.

- bpo-20577: Configuration of the max line length for the FormatParagraph
  extension has been moved from the General tab of the Idle preferences
  dialog to the FormatParagraph tab of the Config Extensions dialog. Patch
  by Tal Einat.

- bpo-16893: Update Idle doc chapter to match current Idle and add new
  information.

- bpo-23180: Rename IDLE "Windows" menu item to "Window". Patch by Al
  Sweigart.

Build
-----

- bpo-15506: Use standard PKG_PROG_PKG_CONFIG autoconf macro in the
  configure script.

- bpo-23032: Fix installer build failures on OS X 10.4 Tiger by disabling
  assembly code in the OpenSSL build.

- bpo-23686: Update OS X 10.5 installer and Windows builds to use OpenSSL
  1.0.2a.

C API
-----

- bpo-23998: PyImport_ReInitLock() now checks for lock allocation error

- bpo-22079: PyType_Ready() now checks that statically allocated type has no
  dynamically allocated bases.


What's New in Python 2.7.9 final?
=================================

*Release date: 2014-12-10*

Library
-------

- bpo-22959: Remove the *check_hostname* parameter of
  httplib.HTTPSConnection. The *context* parameter should be used instead.

- bpo-16043: Add a default limit for the amount of data
  xmlrpclib.gzip_decode will return. This resolves CVE-2013-1753.

- bpo-16042: CVE-2013-1752: smtplib: Limit amount of data read by limiting
  the call to readline().  Original patch by Christian Heimes.

- bpo-16041: In poplib, limit maximum line length read from the server to
  prevent CVE-2013-1752.

- bpo-22960: Add a context argument to xmlrpclib.ServerProxy.

Build
-----

- bpo-22935: Allow the ssl module to be compiled if openssl doesn't support
  SSL 3.

- bpo-17128: Use private version of OpenSSL for 2.7.9 OS X 10.5+ installer.


What's New in Python 2.7.9 release candidate 1?
===============================================

*Release date: 2014-11-25*

Core and Builtins
-----------------

- bpo-21963: backout issue #1856 patch (avoid crashes and lockups when
  daemon threads run while the interpreter is shutting down; instead, these
  threads are now killed when they try to take the GIL), as it seems to
  break some existing code.

- bpo-22604: Fix assertion error in debug mode when dividing a complex
  number by (nan+0j).

- bpo-22470: Fixed integer overflow issues in "backslashreplace" and
  "xmlcharrefreplace" error handlers.

- bpo-22526: Fix iterating through files with lines longer than 2^31 bytes.

- bpo-22519: Fix overflow checking in PyString_Repr.

- bpo-22518: Fix integer overflow issues in latin-1 encoding.

- bpo-22379: Fix empty exception message in a TypeError raised in
  ``str.join``.

- bpo-22221: Now the source encoding declaration on the second line isn't
  effective if the first line contains anything except a comment.

- bpo-22023: Fix ``%S``, ``%R`` and ``%V`` formats of
  :c:func:`PyUnicode_FromFormat`.

- bpo-21591: Correctly handle qualified exec statements in tuple form by
  moving compatibility layer from run-time to AST transformation.

Library
-------

- bpo-22417: Verify certificates by default in httplib (PEP 476).

- bpo-22927: Allow urllib.urlopen to take a *context* parameter to control
  SSL settings for HTTPS connections.

- bpo-22921: Allow SSLContext to take the *hostname* parameter even if
  OpenSSL doesn't support SNI.

- bpo-9003: httplib.HTTPSConnection, urllib2.HTTPSHandler and
  urllib2.urlopen now take optional arguments to allow for server
  certificate checking, as recommended in public uses of HTTPS. This
  backport is part of PEP 467. (See also: bpo-22366)

- bpo-12728: Different Unicode characters having the same uppercase but
  different lowercase are now matched in case-insensitive regular
  expressions.

- bpo-22821: Fixed fcntl() with integer argument on 64-bit big-endian
  platforms.

- bpo-17293: uuid.getnode() now determines MAC address on AIX using netstat.
  Based on patch by Aivars Kalvāns.

- bpo-22769: Fixed ttk.Treeview.tag_has() when called without arguments.

- bpo-22787: Allow the keyfile argument of SSLContext.load_cert_chain to be
  None.

- bpo-22775: Fixed unpickling of Cookie.SimpleCookie with protocol 2. Patch
  by Tim Graham.

- bpo-22776: Brought excluded code into the scope of a try block in
  SysLogHandler.emit().

- bpo-17381: Fixed ranges handling in case-insensitive regular expressions.

- bpo-19329: Optimized compiling charsets in regular expressions.

- bpo-22410: Module level functions in the re module now cache compiled
  locale-dependent regular expressions taking into account the locale.

- bpo-8876: distutils now falls back to copying files when hard linking
  doesn't work. This allows use with special filesystems such as VirtualBox
  shared folders.

- bpo-9351: Defaults set with set_defaults on an argparse subparser are no
  longer ignored when also set on the parent parser.

- bpo-20421: Add a .version() method to SSL sockets exposing the actual
  protocol version in use.

- bpo-22435: Fix a file descriptor leak when SocketServer bind fails.

- bpo-13664: GzipFile now supports non-ascii Unicode filenames.

- bpo-13096: Fixed segfault in CTypes POINTER handling of large values.

- bpo-11694: Raise ConversionError in xdrlib as documented.  Patch by Filip
  Gruszczyński and Claudiu Popa.

- bpo-1686: Fix string.Template when overriding the pattern attribute.

- bpo-11866: Eliminated race condition in the computation of names for new
  threads.

- bpo-22219: The zipfile module CLI now adds entries for directories
  (including empty directories) in ZIP file.

- bpo-22449: In the ssl.SSLContext.load_default_certs, consult the
  environmental variables SSL_CERT_DIR and SSL_CERT_FILE on Windows.

- bpo-8473: doctest.testfile now uses universal newline mode to read the
  test file.

- bpo-20076: Added non derived UTF-8 aliases to locale aliases table.

- bpo-20079: Added locales supported in glibc 2.18 to locale alias table.

- bpo-22530: Allow the ``group()`` method of regular expression match
  objects to take a ``long`` as an index.

- bpo-22517: When an io.BufferedRWPair object is deallocated, clear its
  weakrefs.

- bpo-10510: distutils register and upload methods now use HTML standards
  compliant CRLF line endings.

- bpo-9850: Fixed macpath.join() for empty first component.  Patch by Oleg
  Oshmyan.

- bpo-20912: Now directories added to ZIP file have correct Unix and MS-DOS
  directory attributes.

- bpo-21866: ZipFile.close() no longer writes ZIP64 central directory
  records if allowZip64 is false.

- bpo-22415: Fixed debugging output of the GROUPREF_EXISTS opcode in the re
  module.

- bpo-22423: Unhandled exception in thread no longer causes unhandled
  AttributeError when sys.stderr is None.

- bpo-22419: Limit the length of incoming HTTP request in wsgiref server to
  65536 bytes and send a 414 error code for higher lengths. Patch
  contributed by Devin Cook.

- Lax cookie parsing in http.cookies could be a security issue when combined
  with non-standard cookie handling in some Web browsers.  Reported by
  Sergey Bobrov.

- bpo-21147: sqlite3 now raises an exception if the request contains a null
  character instead of truncating it.  Based on patch by Victor Stinner.

- bpo-21951: Fixed a crash in Tkinter on AIX when called Tcl command with
  empty string or tuple argument.

- bpo-21951: Tkinter now most likely raises MemoryError instead of crash if
  the memory allocation fails.

- bpo-22226: First letter no longer is stripped from the "status" key in the
  result of Treeview.heading().

- bpo-22051: turtledemo no longer reloads examples to re-run them.
  Initialization of variables and gui setup should be done in main(), which
  is called each time a demo is run, but not on import.

- bpo-21597: The separator between the turtledemo text pane and the drawing
  canvas can now be grabbed and dragged with a mouse.  The code text pane
  can be widened to easily view or copy the full width of the text.  The
  canvas can be widened on small screens.  Original patches by Jan Kanis and
  Lita Cho.

- bpo-18132: Turtledemo buttons no longer disappear when the window is
  shrunk.  Original patches by Jan Kanis and Lita Cho.

- bpo-22312: Fix ntpath.splitdrive IndexError.

- bpo-22216: smtplib now resets its state more completely after a quit.  The
  most obvious consequence of the previous behavior was a STARTTLS failure
  during a connect/starttls/quit/connect/starttls sequence.

- bpo-21305: os.urandom now caches a fd to /dev/urandom. This is a PEP 466
  backport from Python 3.

- bpo-21307: As part of PEP 466, backport hashlib.algorithms_guaranteed and
  hashlib.algorithms_available.

- bpo-22259: Fix segfault when attempting to fopen a file descriptor
  corresponding to a directory.

- bpo-22236: Fixed Tkinter images copying operations in NoDefaultRoot mode.

- bpo-22191: Fixed warnings.__all__.

- bpo-21308: Backport numerous features from Python's ssl module. This is
  part of PEP 466.

- bpo-15696: Add a __sizeof__ implementation for mmap objects on Windows.

- bpo-8797: Raise HTTPError on failed Basic Authentication immediately.
  Initial patch by Sam Bull.

- bpo-22068: Avoided reference loops with Variables and Fonts in Tkinter.

- bpo-21448: Changed FeedParser feed() to avoid O(N**2) behavior when
  parsing long line. Original patch by Raymond Hettinger.

- bpo-17923: glob() patterns ending with a slash no longer match non-dirs on
  AIX.  Based on patch by Delhallt.

- bpo-21975: Fixed crash when using uninitialized sqlite3.Row (in particular
  when unpickling pickled sqlite3.Row).  sqlite3.Row is now initialized in
  the __new__() method.

- bpo-16037: HTTPMessage.readheaders() raises an HTTPException when more
  than 100 headers are read. Patch by Jyrki Pulliainen and Daniel Eriksson.

- bpo-21580: Now Tkinter correctly handles binary "data" and "maskdata"
  configure options of tkinter.PhotoImage.

- bpo-19612: subprocess.communicate() now also ignores EINVAL when using at
  least two pipes.

- Fix repr(_socket.socket) on Windows 64-bit: don't fail with OverflowError
  on closed socket.

- bpo-16133: The asynchat.async_chat.handle_read() method now ignores
  socket.error() exceptions with blocking I/O errors: EAGAIN, EALREADY,
  EINPROGRESS, or EWOULDBLOCK.

- bpo-21990: Clean-up unnecessary and slow inner class definition in
  saxutils (Contributed by Alex Gaynor).

- bpo-1730136: Fix the comparison between a tkFont.Font and an object of
  another kind.

- bpo-19884: readline: Disable the meta modifier key if stdout is not a
  terminal to not write the ANSI sequence "\033[1034h" into stdout. This
  sequence is used on some terminal (ex: TERM=xterm-256color") to enable
  support of 8 bit characters.

- bpo-22017: Correct reference counting error in the initialization of the
  _warnings module.

- bpo-21868: Prevent turtle crash when undo buffer set to a value less than
  one.

- bpo-21151: Fixed a segfault in the _winreg module when ``None`` is passed
  as a ``REG_BINARY`` value to SetValueEx.  Patch by John Ehresman.

- bpo-21090: io.FileIO.readall() does not ignore I/O errors anymore. Before,
  it ignored I/O errors if at least the first C call read() succeed.

- bpo-19870: BaseCookie now parses 'secure' and 'httponly' flags. Backport
  of issue #16611.

- bpo-21923: Prevent AttributeError in
  distutils.sysconfig.customize_compiler due to possible uninitialized
  _config_vars.

- bpo-21323: Fix CGIHTTPServer to again handle scripts in CGI
  subdirectories, broken by the fix for security issue #19435.  Patch by
  Zach Byrne.

- bpo-22199: Make get_makefile_filename() available in Lib/sysconfig.py for
  2.7 to match other versions of sysconfig.

IDLE
----

- bpo-3068: Add Idle extension configuration dialog to Options menu. Changes
  are written to HOME/.idlerc/config-extensions.cfg. Original patch by Tal
  Einat.

- bpo-16233: A module browser (File : Class Browser, Alt+C) requires an
  editor window with a filename.  When Class Browser is requested otherwise,
  from a shell, output window, or 'Untitled' editor, Idle no longer displays
  an error box. It now pops up an Open Module box (Alt+M). If a valid name
  is entered and a module is opened, a corresponding browser is also opened.

- bpo-4832: Save As to type Python files automatically adds .py to the name
  you enter (even if your system does not display it).  Some systems
  automatically add .txt when type is Text files.

- bpo-21986: Code objects are not normally pickled by the pickle module. To
  match this, they are no longer pickled when running under Idle.

- bpo-22221: IDLE now ignores the source encoding declaration on the second
  line if the first line contains anything except a comment.

- bpo-17390: Adjust Editor window title; remove 'Python', move version to
  end.

- bpo-14105: Idle debugger breakpoints no longer disappear when inserting or
  deleting lines.

Library
-------

- bpo-22381: Update zlib to 1.2.8.

- bpo-22176: Update the ctypes module's libffi to v3.1.  This release adds
  support for the Linux AArch64 and POWERPC ELF ABIv2 little endian
  architectures.

Tools/Demos
-----------

- bpo-10712: 2to3 has a new "asserts" fixer that replaces deprecated names
  of unittest methods (e.g. failUnlessEqual -> assertEqual).

- bpo-22221: 2to3 and the findnocoding.py script now ignore the source
  encoding declaration on the second line if the first line contains
  anything except a comment.

- bpo-22201: Command-line interface of the zipfile module now correctly
  extracts ZIP files with directory entries.  Patch by Ryan Wilson.

Tests
-----

- bpo-22236: Tkinter tests now don't reuse default root window.  New root
  window is created for every test class.

- bpo-18004: test_overflow in test_list by mistake consumed 40 GiB of memory
  on 64-bit systems.

- bpo-21976: Fix test_ssl to accept LibreSSL version strings.  Thanks to
  William Orr.

- bpo-22770: Prevent some Tk segfaults on OS X when running gui tests.

Build
-----

- bpo-20221: Removed conflicting (or circular) hypot definition when
  compiled with VS 2010 or above.  Initial patch by Tabrez Mohammed.

- bpo-16537: Check whether self.extensions is empty in setup.py. Patch by
  Jonathan Hosmer.

- The documentation Makefile no longer automatically downloads Sphinx. Users
  are now required to have Sphinx already installed to build the
  documentation.

- bpo-21958: Define HAVE_ROUND when building with Visual Studio 2013 and
  above.  Patch by Zachary Turner.

- bpo-15759: "make suspicious", "make linkcheck" and "make doctest" in Doc/
  now display special message when and only when there are failures.

- bpo-21166: Prevent possible segfaults and other random failures of python
  ``--generate-posix-vars`` in pybuilddir.txt build target.

- bpo-18096: Fix library order returned by python-config.

- bpo-17219: Add library build dir for Python extension cross-builds.

- bpo-22877: PEP 477 - OS X installer now installs pip.

- bpo-22878: PEP 477 - "make install" and "make altinstall" can now install
  or upgrade pip, using the bundled pip provided by the backported ensurepip
  module.  A configure option, --with-ensurepip[=upgrade|install|no], is
  available to set the option for subsequent installs; the default for
  Python 2 in "no" (do not install or upgrade pip).  The option can also be
  set with "make [alt]install ENSUREPIP=[upgrade|install|no]".

Windows
-------

- bpo-17896: The Windows build scripts now expect external library sources
  to be in ``PCbuild\..\externals`` rather than ``PCbuild\..\..``.

- bpo-17717: The Windows build scripts now use a copy of NASM pulled from
  svn.python.org to build OpenSSL.

- bpo-22644: The bundled version of OpenSSL has been updated to 1.0.1j.


What's New in Python 2.7.8 final?
=================================

*Release date: 2014-06-29*

Core and Builtins
-----------------

- bpo-4346: In PyObject_CallMethod and PyObject_CallMethodObjArgs, don't
  overwrite the error set in PyObject_GetAttr.

- bpo-21831: Avoid integer overflow when large sizes and offsets are given
  to the buffer type. CVE-2014-7185.

- bpo-19656: Running Python with the -3 option now also warns about
  non-ascii bytes literals.

- bpo-21642: If the conditional if-else expression, allow an integer written
  with no space between itself and the ``else`` keyword (e.g. ``True if
  42else False``) to be valid syntax.

- bpo-21523: Fix over-pessimistic computation of the stack effect of some
  opcodes in the compiler.  This also fixes a quadratic compilation time
  issue noticeable when compiling code with a large number of "and" and "or"
  operators.

Library
-------

- bpo-21652: Prevent mimetypes.type_map from containing unicode keys on
  Windows.

- bpo-21729: Used the "with" statement in the dbm.dumb module to ensure
  files closing.

- bpo-21672: Fix the behavior of ntpath.join on UNC-style paths.

- bpo-19145: The times argument for itertools.repeat now handles negative
  values the same way for keyword arguments as it does for positional
  arguments.

- bpo-21832: Require named tuple inputs to be exact strings.

- bpo-8343: Named group error messages in the re module did not show the
  name of the erroneous group.

- bpo-21491: SocketServer: Fix a race condition in child processes reaping.

- bpo-21635: The difflib SequenceMatcher.get_matching_blocks() method cache
  didn't match the actual result.  The former was a list of tuples and the
  latter was a list of named tuples.

- bpo-21722: The distutils "upload" command now exits with a non-zero return
  code when uploading fails.  Patch by Martin Dengler.

- bpo-21766: Prevent a security hole in CGIHTTPServer by URL unquoting paths
  before checking for a CGI script at that path.

- bpo-21310: Fixed possible resource leak in failed open().

- bpo-21304: Backport the key derivation function hashlib.pbkdf2_hmac from
  Python 3 per PEP 466.

- bpo-11709: Fix the pydoc.help function to not fail when sys.stdin is not a
  valid file.

- bpo-13223: Fix pydoc.writedoc so that the HTML documentation for methods
  that use 'self' in the example code is generated correctly.

- bpo-21552: Fixed possible integer overflow of too long string lengths in
  the tkinter module on 64-bit platforms.

- bpo-14315: The zipfile module now ignores extra fields in the central
  directory that are too short to be parsed instead of letting a
  struct.unpack error bubble up as this "bad data" appears in many real
  world zip files in the wild and is ignored by other zip tools.

- bpo-21402: Tkinter.ttk now works when default root window is not set.

- bpo-10203: sqlite3.Row now truly supports sequence protocol.  In particulr
  it supports reverse() and negative indices.  Original patch by Claudiu
  Popa.

- bpo-8743: Fix interoperability between set objects and the
  collections.Set() abstract base class.

- bpo-21481: Argparse equality and inequality tests now return
  NotImplemented when comparing to an unknown type.

IDLE
----

- bpo-21940: Add unittest for WidgetRedirector. Initial patch by Saimadhav
  Heblikar.

- bpo-18592: Add unittest for SearchDialogBase. Patch by Phil Webster.

- bpo-21694: Add unittest for ParenMatch. Patch by Saimadhav Heblikar.

- bpo-21686: add unittest for HyperParser. Original patch by Saimadhav
  Heblikar.

- bpo-12387: Add missing upper(lower)case versions of default Windows key
  bindings for Idle so Caps Lock does not disable them. Patch by Roger
  Serwy.

- bpo-21695: Closing a Find-in-files output window while the search is still
  in progress no longer closes Idle.

- bpo-18910: Add unittest for textView. Patch by Phil Webster.

- bpo-18292: Add unittest for AutoExpand. Patch by Saihadhav Heblikar.

- bpo-18409: Add unittest for AutoComplete. Patch by Phil Webster.

Tests
-----

- bpo-20155: Changed HTTP method names in failing tests in test_httpservers
  so that packet filtering software (specifically Windows Base Filtering
  Engine) does not interfere with the transaction semantics expected by the
  tests.

- bpo-19493: Refactored the ctypes test package to skip tests explicitly
  rather than silently.

- bpo-18492: All resources are now allowed when tests are not run by
  regrtest.py.

- bpo-21605: Added tests for Tkinter images.

- bpo-21493: Added test for ntpath.expanduser().  Original patch by Claudiu
  Popa.

- bpo-19925: Added tests for the spwd module. Original patch by Vajrasky
  Kok.

- bpo-13355: random.triangular() no longer fails with a ZeroDivisionError
  when low equals high.

- bpo-21522: Added Tkinter tests for Listbox.itemconfigure(),
  PanedWindow.paneconfigure(), and Menu.entryconfigure().

- bpo-20635: Added tests for Tk geometry managers.

Build
-----

- bpo-21811: Anticipated fixes to support OS X versions > 10.9.

Windows
-------

- bpo-21671: The bundled version of OpenSSL has been updated to 1.0.1h. (See
  also: CVE-2014-0224)


What's New in Python 2.7.7 final?
=================================

*Release date: 2014-05-31*

Build
-----

- bpo-21462: Build the Windows installers with OpenSSL 1.0.1g.

- bpo-19866: Include some test data in the Windows installers, so tests
  don't fail.


What's New in Python 2.7.7 release candidate 1?
===============================================

*Release date: 2014-05-17*

Core and Builtins
-----------------

- bpo-21350: Fix file.writelines() to accept arbitrary buffer objects, as
  advertised. Patch by Brian Kearns.

- bpo-20437: Fixed 43 potential bugs when deleting object references.

- bpo-21134: Fix segfault when str is called on an uninitialized
  UnicodeEncodeError, UnicodeDecodeError, or UnicodeTranslateError object.

- bpo-20494: Ensure that free()d memory arenas are really released on POSIX
  systems supporting anonymous memory mappings.  Patch by Charles-François
  Natali.

- bpo-17825: Cursor "^" is correctly positioned for SyntaxError and
  IndentationError.

- Raise a better error when non-unicode codecs are used for a file's coding
  cookie.

- bpo-17976: Fixed potential problem with file.write() not detecting IO
  error by inspecting the return value of fwrite().  Based on patches by
  Jaakko Moisio and Victor Stinner.

- bpo-14432: Generator now clears the borrowed reference to the thread
  state. Fix a crash when a generator is created in a C thread that is
  destroyed while the generator is still used. The issue was that a
  generator contains a frame, and the frame kept a reference to the Python
  state of the destroyed C thread. The crash occurs when a trace function is
  setup.

- bpo-19932: Fix typo in import.h, missing whitespaces in function
  prototypes.

- bpo-19638: Fix possible crash / undefined behaviour from huge (more than 2
  billion characters) input strings in _Py_dg_strtod.

- bpo-12546: Allow \x00 to be used as a fill character when using str, int,
  float, and complex __format__ methods.

Library
-------

- bpo-10744: Fix PEP 3118 format strings on ctypes objects with a nontrivial
  shape.

- bpo-7776: Backport Fix ``Host:'' header and reconnection when using
  http.client.HTTPConnection.set_tunnel() from Python 3.  Patch by Nikolaus
  Rath.

- bpo-21306: Backport hmac.compare_digest from Python 3. This is part of PEP
  466.

- bpo-21470: Do a better job seeding the random number generator by using
  enough bytes to span the full state space of the Mersenne Twister.

- bpo-21469: Reduced the risk of false positives in robotparser by checking
  to make sure that robots.txt has been read or does not exist prior to
  returning True in can_fetch().

- bpo-21321: itertools.islice() now releases the reference to the source
  iterator when the slice is exhausted.  Patch by Anton Afanasyev.

- bpo-9291: Do not attempt to re-encode mimetype data read from registry in
  ANSI mode. Initial patches by Dmitry Jemerov & Vladimir Iofik.

- bpo-21349: Passing a memoryview to _winreg.SetValueEx now correctly raises
  a TypeError where it previously crashed the interpreter. Patch by Brian
  Kearns

- bpo-21529: Fix arbitrary memory access in JSONDecoder.raw_decode with a
  negative second parameter. Bug reported by Guido Vranken. (See also:
  CVE-2014-4616)

- bpo-21172: isinstance check relaxed from dict to collections.Mapping.

- bpo-21191: In os.fdopen, never close the file descriptor when an exception
  happens.

- bpo-21149: Improved thread-safety in logging cleanup during interpreter
  shutdown. Thanks to Devin Jeanpierre for the patch.

- Fix possible overflow bug in strop.expandtabs. You shouldn't be using this
  module!

- bpo-20145: `assertRaisesRegex` now raises a TypeError if the second
  argument is not a string or compiled regex.

- bpo-21058: Fix a leak of file descriptor in tempfile.NamedTemporaryFile(),
  close the file descriptor if os.fdopen() fails

- bpo-20283: RE pattern methods now accept the string keyword parameters as
  documented. The pattern and source keyword parameters are left as
  deprecated aliases.

- bpo-11599: When an external command (e.g. compiler) fails, distutils now
  prints out the whole command line (instead of just the command name) if
  the environment variable DISTUTILS_DEBUG is set.

- bpo-4931: distutils should not produce unhelpful "error: None" messages
  anymore. distutils.util.grok_environment_error is kept but doc-deprecated.

- Improve the random module's default seeding to use 256 bits of entropy
  from os.urandom().  This was already done for Python 3, mildly improving
  security with a bigger seed space.

- bpo-15618: Make turtle.py compatible with 'from __future__ import
  unicode_literals'. Initial patch by Juancarlo Añez.

- bpo-20501: fileinput module no longer reads whole file into memory when
  using fileinput.hook_encoded.

- bpo-6815: os.path.expandvars() now supports non-ASCII Unicode environment
  variables names and values.

- bpo-20635: Fixed grid_columnconfigure() and grid_rowconfigure() methods of
  Tkinter widgets to work in wantobjects=True mode.

- bpo-17671: Fixed a crash when use non-initialized io.BufferedRWPair. Based
  on patch by Stephen Tu.

- bpo-8478: Untokenizer.compat processes first token from iterator input.
  Patch based on lines from Georg Brandl, Eric Snow, and Gareth Rees.

- bpo-20594: Avoid name clash with the libc function posix_close.

- bpo-19856: shutil.move() failed to move a directory to other directory on
  Windows if source name ends with os.altsep.

- bpo-14983: email.generator now always adds a line end after each MIME
  boundary marker, instead of doing so only when there is an epilogue.  This
  fixes an RFC compliance bug and solves an issue with signed MIME parts.

- bpo-20013: Some imap servers disconnect if the current mailbox is deleted,
  and imaplib did not handle that case gracefully.  Now it handles the 'bye'
  correctly.

- bpo-20426: When passing the re.DEBUG flag, re.compile() displays the debug
  output every time it is called, regardless of the compilation cache.

- bpo-20368: The null character now correctly passed from Tcl to Python (in
  unicode strings only).  Improved error handling in variables-related
  commands.

- bpo-20435: Fix _pyio.StringIO.getvalue() to take into account newline
  translation settings.

- bpo-20288: fix handling of invalid numeric charrefs in HTMLParser.

- bpo-19456: ntpath.join() now joins relative paths correctly when a drive
  is present.

- bpo-8260: The read(), readline() and readlines() methods of
  codecs.StreamReader returned incomplete data when were called after
  readline() or read(size). Based on patch by Amaury Forgeot d'Arc.

- bpo-20374: Fix build with GNU readline >= 6.3.

- bpo-14548: Make multiprocessing finalizers check pid before running to
  cope with possibility of gc running just after fork. (Backport from 3.x.)

- bpo-20262: Warnings are raised now when duplicate names are added in the
  ZIP file or too long ZIP file comment is truncated.

- bpo-20270: urllib and urlparse now support empty ports.

- bpo-20243: TarFile no longer raise ReadError when opened in write mode.

- bpo-20245: The open functions in the tarfile module now correctly handle
  empty mode.

- bpo-20086: Restored the use of locale-independent mapping instead of
  locale-dependent str.lower() in locale.normalize().

- bpo-20246: Fix buffer overflow in socket.recvfrom_into.

- bpo-19082: Working SimpleXMLRPCServer and xmlrpclib examples, both in
  modules and documentation.

- bpo-13107: argparse and optparse no longer raises an exception when output
  a help on environment with too small COLUMNS.  Based on patch by Elazar
  Gershuni.

- bpo-20207: Always disable SSLv2 except when PROTOCOL_SSLv2 is explicitly
  asked for.

- bpo-20072: Fixed multiple errors in tkinter with wantobjects is False.

- bpo-1065986: pydoc can now handle unicode strings.

- bpo-16039: CVE-2013-1752: Change use of readline in imaplib module to
  limit line length.  Patch by Emil Lind.

- bpo-19422: Explicitly disallow non-SOCK_STREAM sockets in the ssl module,
  rather than silently let them emit clear text data.

- bpo-20027: Fixed locale aliases for devanagari locales.

- bpo-20067: Tkinter variables now work when wantobjects is false.

- bpo-19020: Tkinter now uses splitlist() instead of split() in configure
  methods.

- bpo-12226: HTTPS is now used by default when connecting to PyPI.

- bpo-20048: Fixed ZipExtFile.peek() when it is called on the boundary of
  the uncompress buffer and read() goes through more than one readbuffer.

- bpo-20034: Updated alias mapping to most recent locale.alias file from
  X.org distribution using makelocalealias.py.

- bpo-5815: Fixed support for locales with modifiers.  Fixed support for
  locale encodings with hyphens.

- bpo-20026: Fix the sqlite module to handle correctly invalid isolation
  level (wrong type).

- bpo-18829: csv.Dialect() now checks type for delimiter, escapechar and
  quotechar fields.  Original patch by Vajrasky Kok.

- bpo-19855: uuid.getnode() on Unix now looks on the PATH for the
  executables used to find the mac address, with /sbin and /usr/sbin as
  fallbacks.

- bpo-20007: HTTPResponse.read(0) no more prematurely closes connection.
  Original patch by Simon Sapin.

- bpo-19912: Fixed numerous bugs in ntpath.splitunc().

- bpo-19623: Fixed writing to unseekable files in the aifc module. Fixed
  writing 'ulaw' (lower case) compressed AIFC files.

- bpo-17919: select.poll.register() again works with poll.POLLNVAL on AIX.
  Fixed integer overflow in the eventmask parameter.

- bpo-17200: telnetlib's read_until and expect timeout was broken by the fix
  to Issue #14635 in Python 2.7.4 to be interpreted as milliseconds instead
  of seconds when the platform supports select.poll (ie: everywhere). It is
  now treated as seconds once again.

- bpo-19099: The struct module now supports Unicode format strings.

- bpo-19878: Fix segfault in bz2 module after calling __init__ twice with
  non-existent filename. Initial patch by Vajrasky Kok.

- bpo-16373: Prevent infinite recursion for ABC Set class comparisons.

- bpo-19138: doctest's IGNORE_EXCEPTION_DETAIL now allows a match when no
  exception detail exists (no colon following the exception's name, or a
  colon does follow but no text follows the colon).

- bpo-16231: Fixed pickle.Pickler to only fallback to its default pickling
  behaviour when Pickler.persistent_id returns None, but not for any other
  false values. This allows false values other than None to be used as
  persistent IDs.  This behaviour is consistent with cPickle.

- bpo-11508: Fixed uuid.getnode() and uuid.uuid1() on environment with
  virtual interface. Original patch by Kent Frazier.

- bpo-11489: JSON decoder now accepts lone surrogates.

- Fix test.test_support.bind_port() to not cause an error when Python was
  compiled on a system with SO_REUSEPORT defined in the headers but run on a
  system with an OS kernel that does not support that new socket option.

- bpo-19633: Fixed writing not compressed 16- and 32-bit wave files on
  big-endian platforms.

- bpo-19449: in csv's writerow, handle non-string keys when generating the
  error message that certain keys are not in the 'fieldnames' list.

- bpo-12853: Fix NameError in distutils.command.upload.

- bpo-19523: Closed FileHandler leak which occurred when delay was set.

- bpo-1575020: Fixed support of 24-bit wave files on big-endian platforms.

- bpo-19480: HTMLParser now accepts all valid start-tag names as defined by
  the HTML5 standard.

- bpo-17827: Add the missing documentation for ``codecs.encode`` and
  ``codecs.decode``.

- bpo-6157: Fixed Tkinter.Text.debug().  Original patch by Guilherme Polo.

- bpo-6160: The bbox() method of tkinter.Spinbox now returns a tuple of
  integers instead of a string.  Based on patch by Guilherme Polo.

- bpo-19286: Directories in ``package_data`` are no longer added to the
  filelist, preventing failure outlined in the ticket.

- bpo-6676: Ensure a meaningful exception is raised when attempting to parse
  more than one XML document per pyexpat xmlparser instance. (Original
  patches by Hirokazu Yamamoto and Amaury Forgeot d'Arc, with suggested
  wording by David Gutteridge)

- bpo-21311: Avoid exception in _osx_support with non-standard compiler
  configurations. Patch by John Szakmeister.

Tools/Demos
-----------

- bpo-3561: The Windows installer now has an option, off by default, for
  placing the Python installation into the system "Path" environment
  variable. This was backported from Python 3.3.

- Add support for ``yield from`` to 2to3.

- Add support for the PEP 465 matrix multiplication operator to 2to3.

- bpo-19936: Added executable bits or shebang lines to Python scripts which
  requires them.  Disable executable bits and shebang lines in test and
  benchmark files in order to prevent using a random system python, and in
  source files of modules which don't provide command line interface.

IDLE
----

- bpo-18104: Add idlelib/idle_test/htest.py with a few sample tests to begin
  consolidating and improving human-validated tests of Idle. Change other
  files as needed to work with htest.  Running the module as __main__ runs
  all tests.

- bpo-21139: Change default paragraph width to 72, the PEP 8 recommendation.

- bpo-21284: Paragraph reformat test passes after user changes reformat
  width.

- bpo-20406: Use Python application icons for Idle window title bars. Patch
  mostly by Serhiy Storchaka.

- bpo-21029: Occurrences of "print" are now consistently colored as being a
  keyword (the colorizer doesn't know if print functions are enabled in the
  source).

- bpo-17721: Remove non-functional configuration dialog help button until we
  make it actually gives some help when clicked. Patch by Guilherme Simões.

- bpo-17390: Add Python version to Idle editor window title bar. Original
  patches by Edmond Burnett and Kent Johnson.

- bpo-20058: sys.stdin.readline() in IDLE now always returns only one line.

- bpo-19481: print() of unicode, str or bytearray subclass instance in IDLE
  no more hangs.

- bpo-18270: Prevent possible IDLE AttributeError on OS X when no initial
  shell window is present.

- bpo-17654: Ensure IDLE menus are customized properly on OS X for
  non-framework builds and for all variants of Tk.

Tests
-----

- bpo-17752: Fix distutils tests when run from the installed location.

- bpo-18604: Consolidated checks for GUI availability.  All platforms now at
  least check whether Tk can be instantiated when the GUI resource is
  requested.

- bpo-20946: Correct alignment assumptions of some ctypes tests.

- bpo-20743: Fix a reference leak in test_tcl.

- bpo-20510: Rewrote test_exit in test_sys to match existing comments, use
  modern unittest features, and use helpers from test.script_helper instead
  of using subprocess directly.  Initial patch by Gareth Rees.

- bpo-20532: Tests which use _testcapi now are marked as CPython only.

- bpo-19920: Added tests for TarFile.list().  Based on patch by Vajrasky
  Kok.

- bpo-19990: Added tests for the imghdr module.  Based on patch by Claudiu
  Popa.

- bpo-19804: The test_find_mac test in test_uuid is now skipped if the
  ifconfig executable is not available.

- bpo-19886: Use better estimated memory requirements for bigmem tests.

- Backported tests for Tkinter variables.

- bpo-19320: test_tcl no longer fails when wantobjects is false.

- bpo-19683: Removed empty tests from test_minidom.  Initial patch by
  Ajitesh Gupta.

- bpo-19928: Implemented a test for repr() of cell objects.

- bpo-19595: Re-enabled a long-disabled test in test_winsound. (See also:
  bpo-19987)

- bpo-19588: Fixed tests in test_random that were silently skipped most of
  the time. Patch by Julian Gindi.

- bpo-17883: Tweak test_tcl testLoadWithUNC to skip the test in the event of
  a permission error on Windows and to properly report other skip
  conditions.

- bpo-17883: Backported _is_gui_available() in test.test_support to avoid
  hanging Windows buildbots on test_ttk_guionly.

- bpo-18702: All skipped tests now reported as skipped. (See also:
  bpo-19572)

- bpo-19085: Added basic tests for all tkinter widget options.

- bpo-20605: Make test_socket getaddrinfo OS X segfault test more robust.

- bpo-20939: Avoid various network test failures due to new redirect of
  http://www.python.org/ to https://www.python.org: use
  http://www.example.com instead.

- bpo-21093: Prevent failures of ctypes test_macholib on OS X if a copy of
  libz exists in $HOME/lib or /usr/local/lib.

Build
-----

- bpo-21285: Refactor and fix curses configure check to always search in a
  ncursesw directory.

Documentation
-------------

- bpo-20255: Update the about and bugs pages.

- bpo-18840: Introduce the json module in the tutorial, and de-emphasize the
  pickle module.

- bpo-19795: Improved markup of True/False constants.

Windows
-------

- bpo-21303: Updated the version of Tcl/Tk included in the installer from
  8.5.2 to 8.5.15. (See also: bpo-20565)

macOS
-----

- As of 2.7.8, the 32-bit-only installer will support OS X 10.5 and later
  systems as is currently done for Python 3.x installers. For 2.7.7 only, we
  will provide three installers: the legacy deprecated 10.3+ 32-bit-only
  format; the newer 10.5+ 32-bit-only format; and the unchanged 10.6+
  64-/32-bit format. Although binary installers will no longer be available
  from python.org as of 2.7.8, it will still be possible to build from
  source on 10.3.9 and 10.4 systems if necessary. See
  Mac/BuildScript/README.txt for more information.


What's New in Python 2.7.6 final?
=================================

*Release date: 2013-11-10*

Library
-------

- bpo-19435: Fix directory traversal attack on CGIHttpRequestHandler.

IDLE
----

- bpo-19426: Fixed the opening of Python source file with specified
  encoding.

Tests
-----

- bpo-19457: Fixed xmlcharrefreplace tests on wide build when tests are
  loaded from .py[co] files.

Build
-----

- bpo-15663: Revert OS X installer built-in Tcl/Tk support for 2.7.6. Some
  third-party projects, such as Matplotlib and PIL/Pillow, depended on being
  able to build with Tcl and Tk frameworks in /Library/Frameworks.


What's New in Python 2.7.6 release candidate 1?
===============================================

*Release date: 2013-10-26*

Core and Builtins
-----------------

- bpo-18603: Ensure that PyOS_mystricmp and PyOS_mystrnicmp are in the
  Python executable and not removed by the linker's optimizer.

- bpo-19279: UTF-7 decoder no more produces illegal unicode strings.

- bpo-18739: Fix an inconsistency between math.log(n) and math.log(long(n));
  the results could be off from one another by a ulp or two.

- bpo-13461: Fix a crash in the "replace" error handler on 64-bit platforms.
  Patch by Yogesh Chaudhari.

- bpo-15866: The xmlcharrefreplace error handler no more produces two XML
  entities for a non-BMP character on narrow build.

- bpo-18184: PyUnicode_FromFormat() and PyUnicode_FromFormatV() now raise
  OverflowError when an argument of %c format is out of range.

- bpo-18137: Detect integer overflow on precision in float.__format__() and
  complex.__format__().

- bpo-18038: SyntaxError raised during compilation sources with illegal
  encoding now always contains an encoding name.

- bpo-18019: Fix crash in the repr of dictionaries containing their own
  views.

- bpo-18427: str.replace could crash the interpreter with huge strings.

Library
-------

- bpo-19393: Fix symtable.symtable function to not be confused when there
  are functions or classes named "top".

- bpo-19327: Fixed the working of regular expressions with too big charset.

- bpo-19350: Increasing the test coverage of macurl2path. Patch by Colin
  Williams.

- bpo-19352: Fix unittest discovery when a module can be reached through
  several paths (e.g. under Debian/Ubuntu with virtualenv).

- bpo-15207: Fix mimetypes to read from correct part of Windows registry
  Original patch by Dave Chambers

- bpo-8964: fix platform._sys_version to handle IronPython 2.6+. Patch by
  Martin Matusiak.

- bpo-16038: CVE-2013-1752: ftplib: Limit amount of data read by limiting
  the call to readline().  Original patch by Michał Jastrzębski and
  Giampaolo Rodola.

- bpo-19276: Fixed the wave module on 64-bit big-endian platforms.

- bpo-18458: Prevent crashes with newer versions of libedit.  Its readline
  emulation has changed from 0-based indexing to 1-based like gnu readline.
  Original patch by Ronald Oussoren.

- bpo-18919: If the close() method of a writer in the sunau or wave module
  failed, second invocation of close() and destructor no more raise an
  exception.  Second invocation of close() on sunau writer now has no
  effects. The aifc module now accepts lower case of names of the 'ulaw' and
  'alaw' codecs.

- bpo-19131: The aifc module now correctly reads and writes sampwidth of
  compressed streams.

- bpo-19158: A rare race in BoundedSemaphore could allow .release() too
  often.

- bpo-18037: 2to3 now escapes '\u' and '\U' in native strings.

- bpo-19137: The pprint module now correctly formats empty set and frozenset
  and instances of set and frozenset subclasses.

- bpo-16040: CVE-2013-1752: nntplib: Limit maximum line lengths to 2048 to
  prevent readline() calls from consuming too much memory.  Patch by Jyrki
  Pulliainen.

- bpo-12641: Avoid passing "-mno-cygwin" to the mingw32 compiler, except
  when necessary. Patch by Oscar Benjamin.

- Properly initialize all fields of a SSL object after allocation.

- bpo-4366: Fix building extensions on all platforms when --enable-shared is
  used.

- bpo-18950: Fix miscellaneous bugs in the sunau module.
  Au_read.readframes() now updates current file position and reads correct
  number of frames from multichannel stream.  Au_write.writeframesraw() now
  correctly updates current file position.  Au_read and Au_write now
  correctly work with file object if start file position is not a zero.

- bpo-18050: Fixed an incompatibility of the re module with Python 2.7.3 and
  older binaries.

- bpo-19037: The mailbox module now makes all changes to maildir files
  before moving them into place, to avoid race conditions with other
  programs that may be accessing the maildir directory.

- bpo-14984: On POSIX systems, when netrc is called without a filename
  argument (and therefore is reading the user's $HOME/.netrc file), it now
  enforces the same security rules as typical ftp clients: the .netrc file
  must be owned by the user that owns the process and must not be readable
  by any other user.

- bpo-17324: Fix http.server's request handling case on trailing '/'. Patch
  contributed by Vajrasky Kok.

- bpo-19018: The heapq.merge() function no longer suppresses IndexError in
  the underlying iterables.

- bpo-18784: The uuid module no more attempts to load libc via ctypes.CDLL,
  if all necessary functions are already found in libuuid. Patch by Evgeny
  Sologubov.

- bpo-14971: unittest test discovery no longer gets confused when a function
  has a different __name__ than its name in the TestCase class dictionary.

- bpo-18672: Fixed format specifiers for Py_ssize_t in debugging output in
  the _sre module.

- bpo-18830: inspect.getclasstree() no more produces duplicated entries even
  when input list contains duplicates.

- bpo-18909: Fix _tkinter.tkapp.interpaddr() on Windows 64-bit, don't cast
  64-bit pointer to long (32 bits).

- bpo-18876: The FileIO.mode attribute now better reflects the actual mode
  under which the file was opened.  Patch by Erik Bray.

- bpo-18851: Avoid a double close of subprocess pipes when the child process
  fails starting.

- bpo-18418: After fork(), reinit all threads states, not only active ones.
  Patch by A. Jesse Jiryu Davis.

- bpo-11973: Fix a problem in kevent. The flags and fflags fields are now
  properly handled as unsigned.

- bpo-16809: Fixed some tkinter incompatibilities with Tcl/Tk 8.6.

- bpo-16809: Tkinter's splitlist() and split() methods now accept Tcl_Obj
  argument.

- bpo-17119: Fixed integer overflows when processing large Unicode strings
  and tuples in the tkinter module.

- bpo-15233: Python now guarantees that callables registered with the atexit
  module will be called in a deterministic order.

- bpo-18747: Re-seed OpenSSL's pseudo-random number generator after fork. A
  pthread_atfork() parent handler is used to seed the PRNG with pid, time
  and some stack data.

- bpo-8865: Concurrent invocation of select.poll.poll() now raises a
  RuntimeError exception.  Patch by Christian Schubert.

- bpo-13461: Fix a crash in the TextIOWrapper.tell method on 64-bit
  platforms.  Patch by Yogesh Chaudhari.

- bpo-18777: The ssl module now uses the new CRYPTO_THREADID API of OpenSSL
  1.0.0+ instead of the deprecated CRYPTO id callback function.

- bpo-18768: Correct doc string of RAND_edg(). Patch by Vajrasky Kok.

- bpo-18178: Fix ctypes on BSD. dlmalloc.c was compiled twice which broke
  malloc weak symbols.

- bpo-18709: Fix CVE-2013-4238. The SSL module now handles NULL bytes inside
  subjectAltName correctly. Formerly the module has used OpenSSL's
  GENERAL_NAME_print() function to get the string representation of ASN.1
  strings for ``rfc822Name`` (email), ``dNSName`` (DNS) and
  ``uniformResourceIdentifier`` (URI).

- bpo-18756: Improve error reporting in os.urandom() when the failure is due
  to something else than /dev/urandom not existing (for example, exhausting
  the file descriptor limit).

- Fix tkinter regression introduced by the security fix in issue #16248.

- bpo-18676: Change 'positive' to 'non-negative' in queue.py put and get
  docstrings and ValueError messages. Patch by Zhongyue Luo

- bpo-17998: Fix an internal error in regular expression engine.

- bpo-17557: Fix os.getgroups() to work with the modified behavior of
  getgroups(2) on OS X 10.8.  Original patch by Mateusz Lenik.

- bpo-18455: multiprocessing should not retry connect() with same socket.

- bpo-18513: Fix behaviour of cmath.rect w.r.t. signed zeros on OS X 10.8 +
  gcc.

- bpo-18101: Tcl.split() now process Unicode strings nested in a tuple as it
  do with byte strings.

- bpo-18347: ElementTree's html serializer now preserves the case of closing
  tags.

- bpo-17261: Ensure multiprocessing's proxies use proper address.

- bpo-17097: Make multiprocessing ignore EINTR.

- bpo-18155: The csv module now correctly handles csv files that use a
  delimiter character that has a special meaning in regexes, instead of
  throwing an exception.

- bpo-18135: ssl.SSLSocket.write() now raises an OverflowError if the input
  string in longer than 2 gigabytes. The ssl module does not support partial
  write.

- bpo-18167: cgi.FieldStorage no longer fails to handle multipart/form-data
  when \r\n appears at end of 65535 bytes without other newlines.

- bpo-17403: urllib.parse.robotparser normalizes the urls before adding to
  ruleline. This helps in handling certain types invalid urls in a
  conservative manner. Patch contributed by Mher Movsisyan.

- Implement inequality on weakref.WeakSet.

- bpo-17981: Closed socket on error in SysLogHandler.

- bpo-18015: Fix unpickling of 2.7.3 and 2.7.4 namedtuples.

- bpo-17754: Make ctypes.util.find_library() independent of the locale.

- Fix typos in the multiprocessing module.

- bpo-17269: Workaround for socket.getaddrinfo crash on MacOS X with port
  None or "0" and flags AI_NUMERICSERV.

- bpo-18080: When building a C extension module on OS X, if the compiler is
  overridden with the CC environment variable, use the new compiler as the
  default for linking if LDSHARED is not also overridden.  This restores
  Distutils behavior introduced in 2.7.3 and inadvertently dropped in 2.7.4.

- bpo-18071: C extension module builds on OS X could fail with TypeError if
  the Xcode command line tools were not installed.

- bpo-18113: Fixed a refcount leak in the curses.panel module's
  set_userptr() method. Reported by Atsuo Ishimoto.

- bpo-18849: Fixed a Windows-specific tempfile bug where collision with an
  existing directory caused mkstemp and related APIs to fail instead of
  retrying. Report and fix by Vlad Shcherbina.

- bpo-19400: Prevent extension module build failures with Xcode 5 on OS X
  10.8+ when using a universal Python that included a PPC architecture, such
  as with a python.org 32-bit-only binary installer.

Tools/Demos
-----------

- bpo-18873: 2to3 and the findnocoding.py script now detect Python source
  code encoding only in comment lines.

- bpo-18817: Fix a resource warning in Lib/aifc.py demo.

- bpo-18439: Make patchcheck work on Windows for ACKS, NEWS.

- bpo-18448: Fix a typo in Demo/newmetaclasses/Eiffel.py.

- bpo-12990: The "Python Launcher" on OSX could not launch python scripts
  that have paths that include wide characters.

Build
-----

- bpo-16067: Add description into MSI file to replace installer's temporary
  name.

- bpo-18256: Compilation fix for recent AIX releases.  Patch by David
  Edelsohn.

- bpo-18098: The deprecated OS X Build Applet.app fails to build on OS X
  10.8 systems because the Apple-deprecated QuickDraw headers have been
  removed from Xcode 4.  Skip building it in this case.

- bpo-1584: Provide options to override default search paths for Tcl and Tk
  when building _tkinter.

- bpo-15663: Tcl/Tk 8.5.15 is now included with the OS X 10.6+ 64-bit/32-bit
  installer for 10.6+.  It is no longer necessary to install a third-party
  version of Tcl/Tk 8.5 to work around the problems in the Apple-supplied
  Tcl/Tk 8.5 shipped in OS X 10.6 and later releases.

- bpo-19019: Change the OS X installer build script to use CFLAGS instead of
  OPT for special build options.  By setting OPT, some compiler-specific
  options like -fwrapv were overridden and thus not used, which could result
  in broken interpreters when building with clang.

IDLE
----

- bpo-18873: IDLE now detects Python source code encoding only in comment
  lines.

- bpo-18988: The "Tab" key now works when a word is already autocompleted.

- bpo-18489: Add tests for SearchEngine. Original patch by Phil Webster.

- bpo-18429: Format / Format Paragraph, now works when comment blocks are
  selected. As with text blocks, this works best when the selection only
  includes complete lines.

- bpo-18226: Add docstrings and unittests for FormatParagraph.py. Original
  patches by Todd Rovito and Phil Webster.

- bpo-18279: Format - Strip trailing whitespace no longer marks a file as
  changed when it has not been changed. This fix followed the addition of a
  test file originally written by Phil Webster (the issue's main goal).

- bpo-18539: Calltips now work for float default arguments.

- bpo-7136: In the Idle File menu, "New Window" is renamed "New File". Patch
  by Tal Einat, Roget Serwy, and Todd Rovito.

- bpo-8515: Set __file__ when run file in IDLE. Initial patch by Bruce
  Frederiksen.

- bpo-5492: Avoid traceback when exiting IDLE caused by a race condition.

- bpo-17511: Keep IDLE find dialog open after clicking "Find Next". Original
  patch by Sarah K.

- bpo-15392: Create a unittest framework for IDLE. Preliminary patch by
  Rajagopalasarma Jayakrishnan See Lib/idlelib/idle_test/README.txt for how
  to run Idle tests.

- bpo-14146: Highlight source line while debugging on Windows.

- bpo-17532: Always include Options menu for IDLE on OS X. Patch by
  Guilherme Simões.

Tests
-----

- bpo-18919: Added tests for the sunau module.  Unified and extended tests
  for audio modules: aifc, sunau and wave.

- bpo-18792: Use "127.0.0.1" or "::1" instead of "localhost" as much as
  possible, since "localhost" goes through a DNS lookup under recent Windows
  versions.

- bpo-18357: add tests for dictview set difference. Patch by Fraser
  Tweedale.

- bpo-11185: Fix test_wait4 under AIX.  Patch by Sébastien Sablé.

- bpo-18094: test_uuid no more reports skipped tests as passed.

- bpo-11995: test_pydoc doesn't import all sys.path modules anymore.

Documentation
-------------

- bpo-18758: Fixed and improved cross-references.

- bpo-18718: datetime documentation contradictory on leap second support.

- bpo-17701: Improving strftime documentation.

- bpo-17844: Refactor a documentation of Python specific encodings. Add
  links to encoders and decoders for binary-to-binary codecs.


What's New in Python 2.7.5 final?
=================================

*Release date: 2013-05-12*

Core and Builtins
-----------------

- bpo-15535: Fixed regression in the pickling of named tuples by removing
  the __dict__ property introduced in 2.7.4.

- bpo-17857: Prevent build failures with pre-3.5.0 versions of sqlite3, such
  as was shipped with Centos 5 and Mac OS X 10.4.

- bpo-17703: Fix a regression where an illegal use of Py_DECREF() after
  interpreter finalization can cause a crash.

- bpo-16447: Fixed potential segmentation fault when setting __name__ on a
  class.

- bpo-17610: Don't rely on non-standard behavior of the C qsort() function.

Library
-------

- bpo-17979: Fixed the re module in build with --disable-unicode.

- bpo-17606: Fixed support of encoded byte strings in the XMLGenerator
  .characters() and ignorableWhitespace() methods.  Original patch by
  Sebastian Ortiz Vasquez.

- bpo-16601: Restarting iteration over tarfile no more continues from where
  it left off. Patch by Michael Birtwell.

- bpo-16584: in filecomp._cmp, catch IOError as well as os.error. Patch by
  Till Maas.

- bpo-17926: Fix dbm.__contains__ on 64-bit big-endian machines.

- bpo-19267: Fix support of multibyte encoding (ex: UTF-16) in the logging
  module.

- bpo-17918: When using SSLSocket.accept(), if the SSL handshake failed on
  the new socket, the socket would linger indefinitely.  Thanks to Peter
  Saveliev for reporting.

- bpo-17289: The readline module now plays nicer with external modules or
  applications changing the rl_completer_word_break_characters global
  variable.  Initial patch by Bradley Froehle.

- bpo-12181: select module: Fix struct kevent definition on OpenBSD 64-bit
  platforms. Patch by Federico Schwindt.

- bpo-14173: Avoid crashing when reading a signal handler during interpreter
  shutdown.

- bpo-16316: mimetypes now recognizes the .xz and .txz (.tar.xz) extensions.

- bpo-17192: Restore the patch for Issue #10309 which was ommitted in 2.7.4
  when updating the bundled version of libffi used by ctypes.

- bpo-17843: Removed test data file that was triggering false-positive virus
  warnings with certain antivirus software.

- bpo-17353: Plistlib emitted empty data tags with deeply nested
  datastructures

- bpo-11714: Use 'with' statements to assure a Semaphore releases a
  condition variable. Original patch by Thomas Rachel.

- bpo-17795: Reverted backwards-incompatible change in SysLogHandler with
  Unix domain sockets.

- bpo-17555: Fix ForkAwareThreadLock so that size of after fork registry
  does not grow exponentially with generation of process.

- bpo-17710: Fix cPickle raising a SystemError on bogus input.

- bpo-17341: Include the invalid name in the error messages from re about
  invalid group names.

- bpo-17016: Get rid of possible pointer wraparounds and integer overflows
  in the re module.  Patch by Nickolai Zeldovich.

- bpo-17536: Add to webbrowser's browser list: xdg-open, gvfs-open,
  www-browser, x-www-browser, chromium browsers, iceweasel, iceape.

- bpo-17656: Fix extraction of zip files with unicode member paths.

- bpo-17666: Fix reading gzip files with an extra field.

- bpo-13150: sysconfig no longer parses the Makefile and config.h files when
  imported, instead doing it at build time.  This makes importing sysconfig
  faster and reduces Python startup time by 20%. (See also: bpo-17512)

- bpo-13163: Rename operands in smtplib.SMTP._get_socket to correct names;
  fixes otherwise misleading output in tracebacks and when when debug is on.

- bpo-17526: fix an IndexError raised while passing code without filename to
  inspect.findsource().  Initial patch by Tyler Doyle.

Build
-----

- bpo-17547: In configure, explicitly pass -Wformat for the benefit for GCC
  4.8.

- bpo-17682: Add the _io module to Modules/Setup.dist (commented out).

- bpo-17086: Search the include and library directories provided by the
  compiler.

Tests
-----

- bpo-17928: Fix test_structmembers on 64-bit big-endian machines.

- bpo-17883: Fix buildbot testing of Tkinter on Windows. Patch by Zachary
  Ware.

- bpo-7855: Add tests for ctypes/winreg for issues found in IronPython.
  Initial patch by Dino Viehland.

- bpo-17712: Fix test_gdb failures on Ubuntu 13.04.

- bpo-17065: Use process-unique key for winreg tests to avoid failures if
  test is run multiple times in parallel (eg: on a buildbot host).

IDLE
----

- bpo-17838: Allow sys.stdin to be reassigned.

- bpo-14735: Update IDLE docs to omit "Control-z on Windows".

- bpo-17585: Fixed IDLE regression. Now closes when using exit() or quit().

- bpo-17657: Show full Tk version in IDLE's about dialog. Patch by Todd
  Rovito.

- bpo-17613: Prevent traceback when removing syntax colorizer in IDLE.

- bpo-1207589: Backwards-compatibility patch for right-click menu in IDLE.

- bpo-16887: IDLE now accepts Cancel in tabify/untabify dialog box.

- bpo-14254: IDLE now handles readline correctly across shell restarts.

- bpo-17614: IDLE no longer raises exception when quickly closing a file.

- bpo-6698: IDLE now opens just an editor window when configured to do so.

- bpo-8900: Using keyboard shortcuts in IDLE to open a file no longer raises
  an exception.

- bpo-6649: Fixed missing exit status in IDLE. Patch by Guilherme Polo.

- bpo-17390: Display Python version on Idle title bar. Initial patch by
  Edmond Burnett.

Documentation
-------------

- bpo-15940: Specify effect of locale on time functions.

- bpo-6696: add documentation for the Profile objects, and improve
  profile/cProfile docs.  Patch by Tom Pinckney.


What's New in Python 2.7.4 final?
=================================

*Release date: 2013-04-06*

Build
-----

- bpo-17550: Fix the --enable-profiling configure switch.

Core and Builtins
-----------------

- bpo-15801: With string % formatting, relax the type check for a mapping
  such that any type with a __getitem__ can be used on the right hand side.

IDLE
----

- bpo-17625: In IDLE, close the replace dialog after it is used.

Tests
-----

- bpo-17835: Fix test_io when the default OS pipe buffer size is larger than
  one million bytes.

- bpo-17531: Fix tests that thought group and user ids were always the int
  type. Also, always allow -1 as a valid group and user id.

- bpo-17533: Fix test_xpickle with older versions of Python 2.5.

Documentation
-------------

- bpo-17538: Document XML vulnerabilties


What's New in Python 2.7.4 release candidate 1?
===============================================

*Release date: 2013-03-23*

Core and Builtins
-----------------

- bpo-10211: Buffer objects expose the new buffer interface internally

- bpo-16445: Fixed potential segmentation fault when deleting an exception
  message.

- bpo-17275: Corrected class name in init error messages of the C version of
  BufferedWriter and BufferedRandom.

- bpo-7963: Fixed misleading error message that issued when object is called
  without arguments.

- bpo-5308: Raise ValueError when marshalling too large object (a sequence
  with size >= 2**31), instead of producing illegal marshal data.

- bpo-17043: The unicode-internal decoder no longer read past the end of
  input buffer.

- bpo-16979: Fix error handling bugs in the unicode-escape-decode decoder.

- bpo-10156: In the interpreter's initialization phase, unicode globals are
  now initialized dynamically as needed.

- bpo-16975: Fix error handling bug in the escape-decode decoder.

- bpo-14850: Now a charmap decoder treats U+FFFE as "undefined mapping" in
  any mapping, not only in a Unicode string.

- bpo-11461: Fix the incremental UTF-16 decoder. Original patch by Amaury
  Forgeot d'Arc.

- bpo-16367: Fix FileIO.readall() on Windows for files larger than 2 GB.

- bpo-15516: Fix a bug in PyString_FromFormat where it failed to properly
  ignore errors from a __int__() method.

- bpo-16839: Fix a segfault when calling unicode() on a classic class early
  in interpreter initialization.

- bpo-16761: Calling ``int()`` and ``long()`` with *base* argument only now
  raises TypeError.

- bpo-16759: Support the full DWORD (unsigned long) range in Reg2Py when
  retrieving a REG_DWORD value. This corrects functions like
  winreg.QueryValueEx that may have been returning truncated values.

- bpo-14420: Support the full DWORD (unsigned long) range in Py2Reg when
  passed a REG_DWORD value. Fixes ValueError in winreg.SetValueEx when given
  a long.

- bpo-13863: Work around buggy 'fstat' implementation on Windows / NTFS that
  lead to incorrect timestamps (off by one hour) being stored in .pyc files
  on some systems.

- bpo-16602: When a weakref's target was part of a long deallocation chain,
  the object could remain reachable through its weakref even though its
  refcount had dropped to zero.

- bpo-9011: Fix hacky AST code that modified the CST when compiling a
  negated numeric literal.

- bpo-16306: Fix multiple error messages when unknown command line
  parameters where passed to the interpreter.  Patch by Hieu Nguyen.

- bpo-15379: Fix passing of non-BMP characters as integers for the charmap
  decoder (already working as unicode strings).  Patch by Serhiy Storchaka.

- bpo-16453: Fix equality testing of dead weakref objects.

- bpo-9535: Fix pending signals that have been received but not yet handled
  by Python to not persist after os.fork() in the child process.

- bpo-15001: fix segfault on "del sys.modules['__main__']". Patch by Victor
  Stinner.

- bpo-5057: the peepholer no longer optimizes subscription on unicode
  literals (e.g. u'foo'[0]) in order to produce compatible pyc files between
  narrow and wide builds.

- bpo-8401: assigning an int to a bytearray slice (e.g. b[3:4] = 5) now
  raises an error.

- bpo-14700: Fix buggy overflow checks for large width and precision in
  string formatting operations.

- bpo-16345: Fix an infinite loop when ``fromkeys`` on a dict subclass
  received a nonempty dict from the constructor.

- bpo-6074: Ensure cached bytecode files can always be updated by the user
  that created them, even when the source file is read-only.

- bpo-14783: Improve int() and long() docstrings and switch docstrings for
  unicode(), slice(), range(), and xrange() to use multi-line signatures.

- bpo-16030: Fix overflow bug in computing the `repr` of an xrange object
  with large start, step or length.

- bpo-16029: Fix overflow bug occurring when pickling xranges with large
  start, step or length.

- bpo-16037: Limit httplib's _read_status() function to work around broken
  HTTP servers and reduce memory usage. It's actually a backport of a Python
  3.2 fix. Thanks to Adrien Kunysz.

- bpo-16588: Silence unused-but-set warnings in Python/thread_pthread

- bpo-13992: The trashcan mechanism is now thread-safe.  This eliminates
  sporadic crashes in multi-thread programs when several long deallocator
  chains ran concurrently and involved subclasses of built-in container
  types.

- bpo-15801: Make sure mappings passed to '%' formatting are actually
  subscriptable.

- bpo-15604: Update uses of PyObject_IsTrue() to check for and handle errors
  correctly. Patch by Serhiy Storchaka.

- bpo-14579: Fix error handling bug in the utf-16 decoder.  Patch by Serhiy
  Storchaka.

- bpo-15368: An issue that caused bytecode generation to be
  non-deterministic when using randomized hashing (-R) has been fixed.

- bpo-15897: zipimport.c doesn't check return value of fseek(). Patch by
  Felipe Cruz.

- bpo-16369: Global PyTypeObjects not initialized with PyType_Ready(...).

- bpo-15033: Fix the exit status bug when modules invoked using -m switch,
  return the proper failure return value (1). Patch contributed by Jeff
  Knupp.

- bpo-12268: File readline, readlines and read() methods no longer lose data
  when an underlying read system call is interrupted.  IOError is no longer
  raised due to a read system call returning EINTR from within these
  methods.

- bpo-13512: Create ~/.pypirc securely (CVE-2011-4944).  Initial patch by
  Philip Jenvey, tested by Mageia and Debian.

- bpo-7719: Make distutils ignore ``.nfs*`` files instead of choking later
  on.  Initial patch by SilentGhost and Jeff Ramnani.

- bpo-10053: Don't close FDs when FileIO.__init__ fails. Loosely based on
  the work by Hirokazu Yamamoto.

- bpo-14775: Fix a potential quadratic dict build-up due to the garbage
  collector repeatedly trying to untrack dicts.

- bpo-14494: Fix __future__.py and its documentation to note that absolute
  imports are the default behavior in 3.0 instead of 2.7. Patch by Sven
  Marnach.

- bpo-14761: Fix potential leak on an error case in the import machinery.

- bpo-14699: Fix calling the classmethod descriptor directly.

- bpo-11603: Setting __repr__ to __str__ now raises a RuntimeError when
  repr() or str() is called on such an object.

- bpo-14658: Fix binding a special method to a builtin implementation of a
  special method with a different name.

- bpo-14612: Fix jumping around with blocks by setting f_lineno.

- bpo-13889: Check and (if necessary) set FPU control word before calling
  any of the dtoa.c string <-> float conversion functions, on MSVC builds of
  Python. This fixes issues when embedding Python in a Delphi app.

- bpo-14505: Fix file descriptor leak when deallocating file objects created
  with PyFile_FromString().

- bpo-14474: Save and restore exception state in thread.start_new_thread()
  while writing error message if the thread leaves an unhandled exception.

- bpo-13019: Fix potential reference leaks in bytearray.extend().  Patch by
  Suman Saha.

- bpo-14378: Fix compiling ast.ImportFrom nodes with a "__future__" string
  as the module name that was not interned.

- bpo-14331: Use significantly less stack space when importing modules by
  allocating path buffers on the heap instead of the stack.

- bpo-14334: Prevent in a segfault in type.__getattribute__ when it was not
  passed strings. Also fix segfaults in the __getattribute__ and __setattr__
  methods of old-style classes.

- bpo-14161: fix the __repr__ of file objects to escape the file name.

- bpo-1469629: Allow cycles through an object's __dict__ slot to be
  collected. (For example if ``x.__dict__ is x``).

- bpo-13521: dict.setdefault() now does only one lookup for the given key,
  making it "atomic" for many purposes.  Patch by Filip Gruszczyński.

- bpo-1602133: on Mac OS X a shared library build (``--enable-shared``) now
  fills the ``os.environ`` variable correctly.

- bpo-10538: When using the "s*" code with PyArg_ParseTuple() to fill a
  Py_buffer structure with data from an object supporting only the old
  PyBuffer interface, a reference to the source objects is now properly
  added to the Py_buffer.obj member.

Library
-------

- bpo-12718: Fix interaction with winpdb overriding __import__ by setting
  importer attribute on BaseConfigurator instance.

- bpo-17521: Corrected non-enabling of logger following two calls to
  fileConfig().

- bpo-17508: Corrected MemoryHandler configuration in dictConfig() where the
  target handler wasn't configured first.

- bpo-10212: cStringIO and struct.unpack support new buffer objects.

- bpo-12098: multiprocessing on Windows now starts child processes using the
  same sys.flags as the current process.  Initial patch by Sergey Mezentsev.

- bpo-8862: Fixed curses cleanup when getkey is interrupted by a signal.

- bpo-9090: When a socket with a timeout fails with EWOULDBLOCK or EAGAIN,
  retry the select() loop instead of bailing out.  This is because select()
  can incorrectly report a socket as ready for reading (for example, if it
  received some data with an invalid checksum).

- bpo-1285086: Get rid of the refcounting hack and speed up
  urllib.unquote().

- bpo-17368: Fix an off-by-one error in the Python JSON decoder that caused
  a failure while decoding empty object literals when object_pairs_hook was
  specified.

- bpo-17278: Fix a crash in heapq.heappush() and heapq.heappop() when the
  list is being resized concurrently.

- bpo-17018: Make Process.join() retry if os.waitpid() fails with EINTR.

- bpo-14720: sqlite3: Convert datetime microseconds correctly. Patch by Lowe
  Thiderman.

- bpo-17225: JSON decoder now counts columns in the first line starting with
  1, as in other lines.

- bpo-7842: backported fix for py_compile.compile() syntax error handling.

- bpo-13153: Tkinter functions now raise TclError instead of ValueError when
  a unicode argument contains non-BMP character.

- bpo-9669: Protect re against infinite loops on zero-width matching in
  non-greedy repeat.  Patch by Matthew Barnett.

- bpo-13169: The maximal repetition number in a regular expression has been
  increased from 65534 to 2147483647 (on 32-bit platform) or 4294967294 (on
  64-bit).

- bpo-16743: Fix mmap overflow check on 32 bit Windows.

- bpo-11311: StringIO.readline(0) now returns an empty string as all other
  file-like objects.

- bpo-16800: tempfile.gettempdir() no longer left temporary files when the
  disk is full. Original patch by Amir Szekely.

- bpo-13555: cPickle now supports files larger than 2 GiB.

- bpo-17052: unittest discovery should use self.testLoader.

- bpo-4591: Uid and gid values larger than 2**31 are supported now.

- bpo-17141: random.vonmisesvariate() no more hangs for large kappas.

- bpo-17149: Fix random.vonmisesvariate to always return results in the
  range [0, 2*math.pi].

- bpo-1470548: XMLGenerator now works with UTF-16 and UTF-32 encodings.

- bpo-6975: os.path.realpath() now correctly resolves multiple nested
  symlinks on POSIX platforms.

- bpo-7358: cStringIO.StringIO now supports writing to and reading from a
  stream larger than 2 GiB on 64-bit systems.

- bpo-10355: In SpooledTemporaryFile class mode and name properties and
  xreadlines method now work for unrolled files.  encoding and newlines
  properties now removed as they have no sense and always produced
  AttributeError.

- bpo-16686: Fixed a lot of bugs in audioop module.  Fixed crashes in
  avgpp(), maxpp() and ratecv().  Fixed an integer overflow in add(),
  bias(), and ratecv(). reverse(), lin2lin() and ratecv() no more lose
  precision for 32-bit samples. max() and rms() no more returns a negative
  result and various other functions now work correctly with 32-bit sample
  -0x80000000.

- bpo-17073: Fix some integer overflows in sqlite3 module.

- bpo-6083: Fix multiple segmentation faults occurred when PyArg_ParseTuple
  parses nested mutating sequence.

- bpo-5289: Fix ctypes.util.find_library on Solaris.

- bpo-17106: Fix a segmentation fault in io.TextIOWrapper when an underlying
  stream or a decoder produces data of an unexpected type (i.e. when
  io.TextIOWrapper initialized with text stream or use bytes-to-bytes
  codec).

- bpo-13994: Add compatibility alias in distutils.ccompiler for
  distutils.sysconfig.customize_compiler.

- bpo-15633: httplib.HTTPResponse is now mark closed when the server sends
  less than the advertised Content-Length.

- bpo-15881: Fixed atexit hook in multiprocessing.

- bpo-14340: Upgrade the embedded expat library to version 2.1.0.

- bpo-11159: SAX parser now supports unicode file names.

- bpo-6972: The zipfile module no longer overwrites files outside of its
  destination path when extracting malicious zip files.

- bpo-17049: Localized calendar methods now return unicode if a locale
  includes an encoding and the result string contains month or weekday (was
  regression from Python 2.6).

- bpo-4844: ZipFile now raises BadZipfile when opens a ZIP file with an
  incomplete "End of Central Directory" record.  Original patch by Guilherme
  Polo and Alan McIntyre.

- bpo-15505: `unittest.installHandler` no longer assumes SIGINT handler is
  set to a callable object.

- bpo-17051: Fix a memory leak in os.path.isdir() on Windows. Patch by
  Robert Xiao.

- bpo-13454: Fix a crash when deleting an iterator created by
  itertools.tee() if all other iterators were very advanced before.

- bpo-16992: On Windows in signal.set_wakeup_fd, validate the file
  descriptor argument.

- bpo-15861: tkinter now correctly works with lists and tuples containing
  strings with whitespaces, backslashes or unbalanced braces.

- bpo-10527: Use poll() instead of select() for multiprocessing pipes.

- bpo-9720: zipfile now writes correct local headers for files larger than 4
  GiB.

- bpo-13899: \A, \Z, and \B now correctly match the A, Z, and B literals
  when used inside character classes (e.g. '[\A]').  Patch by Matthew
  Barnett.

- bpo-16398: Optimize deque.rotate() so that it only moves pointers and
  doesn't touch the underlying data with increfs and decrefs.

- bpo-15109: Fix regression in sqlite3's iterdump method where it would die
  with an encoding error if the database contained string values containing
  non-ASCII. (Regression was introduced by fix for 9750).

- bpo-15545: Fix regression in sqlite3's iterdump method where it was
  failing if the connection used a row factory (such as sqlite3.Row) that
  produced unsortable objects. (Regression was introduced by fix for 9750).

- bpo-16828: Fix error incorrectly raised by bz2.compress(''). Patch by
  Martin Packman.

- bpo-9586: Redefine SEM_FAILED on MacOSX to keep compiler happy.

- bpo-10527: make multiprocessing use poll() instead of select() if
  available.

- bpo-16485: Now file descriptors are closed if file header patching failed
  on closing an aifc file.

- bpo-12065: connect_ex() on an SSL socket now returns the original errno
  when the socket's timeout expires (it used to return None).

- bpo-16713: Fix the parsing of tel url with params using urlparse module.

- bpo-16443: Add docstrings to regular expression match objects. Patch by
  Anton Kasyanov.

- bpo-8853: Allow port to be of type long for socket.getaddrinfo().

- bpo-16597: In buffered and text IO, call close() on the underlying stream
  if invoking flush() fails.

- bpo-15701: Fix HTTPError info method call to return the headers
  information.

- bpo-16646: ftplib.FTP.makeport() might lose socket error details. (patch
  by Serhiy Storchaka)

- bpo-16626: Fix infinite recursion in glob.glob() on Windows when the
  pattern contains a wildcard in the drive or UNC path.  Patch by Serhiy
  Storchaka.

- bpo-16298: In HTTPResponse.read(), close the socket when there is no
  Content-Length and the incoming stream is finished.  Patch by Eran
  Rundstein.

- bpo-16248: Disable code execution from the user's home directory by
  tkinter when the -E flag is passed to Python.  Patch by Zachary Ware.

- bpo-16628: Fix a memory leak in ctypes.resize().

- bpo-13614: Fix setup.py register failure with invalid rst in description.
  Patch by Julien Courteau and Pierre Paul Lefebvre.

- bpo-10182: The re module doesn't truncate indices to 32 bits anymore.
  Patch by Serhiy Storchaka.

- bpo-16573: In 2to3, treat enumerate() like a consuming call, so
  superfluous list() calls aren't added to filter(), map(), and zip() which
  are directly passed enumerate().

- bpo-1160: Fix compiling large regular expressions on UCS2 builds. Patch by
  Serhiy Storchaka.

- bpo-14313: zipfile now raises NotImplementedError when the compression
  type is unknown.

- bpo-16408: Fix file descriptors not being closed in error conditions in
  the zipfile module.  Patch by Serhiy Storchaka.

- bpo-16327: The subprocess module no longer leaks file descriptors used for
  stdin/stdout/stderr pipes to the child when fork() fails.

- bpo-14396: Handle the odd rare case of waitpid returning 0 when not
  expected in subprocess.Popen.wait().

- bpo-16411: Fix a bug where zlib.decompressobj().flush() might try to
  access previously-freed memory. Patch by Serhiy Storchaka.

- bpo-16350: zlib.decompressobj().decompress() now accumulates data from
  successive calls after EOF in unused_data, instead of only saving the
  argument to the last call. decompressobj().flush() now correctly sets
  unused_data and unconsumed_tail. A bug in the handling of MemoryError when
  setting the unconsumed_tail attribute has also been fixed. Patch by Serhiy
  Storchaka.

- bpo-12759: sre_parse now raises a proper error when the name of the group
  is missing. Initial patch by Serhiy Storchaka.

- bpo-16152: fix tokenize to ignore whitespace at the end of the code when
  no newline is found.  Patch by Ned Batchelder.

- bpo-16230: Fix a crash in select.select() when one of the lists changes
  size while iterated on.  Patch by Serhiy Storchaka.

- bpo-16228: Fix a crash in the json module where a list changes size while
  it is being encoded.  Patch by Serhiy Storchaka.

- bpo-14897: Enhance error messages of struct.pack and struct.pack_into.
  Patch by Matti Mäki.

- bpo-12890: cgitb no longer prints spurious <p> tags in text mode when the
  logdir option is specified.

- bpo-14398: Fix size truncation and overflow bugs in the bz2 module.

- bpo-5148: Ignore 'U' in mode given to gzip.open() and gzip.GzipFile().

- bpo-16220: wsgiref now always calls close() on an iterable response. Patch
  by Brent Tubbs.

- bpo-16461: Wave library should be able to deal with 4GB wav files, and
  sample rate of 44100 Hz.

- bpo-16176: Properly identify Windows 8 via platform.platform()

- bpo-15756: subprocess.poll() now properly handles errno.ECHILD to return a
  returncode of 0 when the child has already exited or cannot be waited on.

- bpo-12376: Pass on parameters in TextTestResult.__init__ super call

- bpo-15222: Insert blank line after each message in mbox mailboxes

- bpo-16013: Fix CSV Reader parsing issue with ending quote characters.
  Patch by Serhiy Storchaka.

- bpo-15421: fix an OverflowError in Calendar.itermonthdates() after
  datetime.MAXYEAR. Patch by Cédric Krier.

- bpo-15970: xml.etree.ElementTree now serializes correctly the empty HTML
  elements 'meta' and 'param'.

- bpo-15676: Now "mmap" check for empty files before doing the offset check.
  Patch by Steven Willis.

- bpo-15340: Fix importing the random module when /dev/urandom cannot be
  opened.  This was a regression caused by the hash randomization patch.

- bpo-15841: The readable(), writable() and seekable() methods of io.BytesIO
  and io.StringIO objects now raise ValueError when the object has been
  closed. Patch by Alessandro Moura.

- bpo-16112: platform.architecture does not correctly escape argument to
  /usr/bin/file. Patch by David Benjamin.

- bpo-12776: call argparse type function (specified by add_argument) only
  once. Before, the type function was called twice in the case where the
  default was specified and the argument was given as well.  This was
  especially problematic for the FileType type, as a default file would
  always be opened, even if a file argument was specified on the command
  line. (See also: bpo-11839)

- bpo-15906: Fix a regression in argparse caused by the preceding change,
  when action='append', type='str' and default=[].

- bpo-13370: Ensure that ctypes works on Mac OS X when Python is compiled
  using the clang compiler

- bpo-15544: Fix Decimal.__float__ to work with payload-carrying NaNs.

- bpo-15199: Fix JavaScript's default MIME type to application/javascript.
  Patch by Bohuslav Kabrda.

- bpo-15477: In cmath and math modules, add workaround for platforms whose
  system-supplied log1p function doesn't respect signs of zeros.

- bpo-11062: Fix adding a message from file to Babyl mailbox.

- bpo-15646: Prevent equivalent of a fork bomb when using multiprocessing on
  Windows without the "if __name__ == '__main__'" idiom.

- bpo-15567: Fix NameError when running threading._test

- bpo-15424: Add a __sizeof__ implementation for array objects. Patch by
  Ludwig Hähne.

- bpo-15538: Fix compilation of the getnameinfo() / getaddrinfo() emulation
  code.  Patch by Philipp Hagemeister.

- bpo-12288: Consider '0' and '0.0' as valid initialvalue for tkinter
  SimpleDialog.

- bpo-15489: Add a __sizeof__ implementation for BytesIO objects. Patch by
  Serhiy Storchaka.

- bpo-15469: Add a __sizeof__ implementation for deque objects. Patch by
  Serhiy Storchaka.

- bpo-15487: Add a __sizeof__ implementation for buffered I/O objects. Patch
  by Serhiy Storchaka.

- bpo-15512: Add a __sizeof__ implementation for parser. Patch by Serhiy
  Storchaka.

- bpo-15402: An issue in the struct module that caused sys.getsizeof to
  return incorrect results for struct.Struct instances has been fixed.
  Initial patch by Serhiy Storchaka.

- bpo-15232: when mangle_from is True, email.Generator now correctly mangles
  lines that start with 'From ' that occur in a MIME preamble or epilog.

- bpo-13922: argparse no longer incorrectly strips '--'s that appear after
  the first one.

- bpo-12353: argparse now correctly handles null argument values.

- bpo-6493: An issue in ctypes on Windows that caused structure bitfields of
  type ctypes.c_uint32 and width 32 to incorrectly be set has been fixed.

- bpo-14635: telnetlib will use poll() rather than select() when possible to
  avoid failing due to the select() file descriptor limit.

- bpo-15247: FileIO now raises an error when given a file descriptor
  pointing to a directory.

- bpo-14591: Fix bug in Random.jumpahead that could produce an invalid
  Mersenne Twister state on 64-bit machines.

- bpo-5346: Preserve permissions of mbox, MMDF and Babyl mailbox files on
  flush().

- bpo-15219: Fix a reference leak when hashlib.new() is called with invalid
  parameters.

- bpo-9559: If messages were only added, a new file is no longer created and
  renamed over the old file when flush() is called on an mbox, MMDF or Babyl
  mailbox.

- bpo-14653: email.utils.mktime_tz() no longer relies on system mktime()
  when timezone offest is supplied.

- bpo-6056: Make multiprocessing use setblocking(True) on the sockets it
  uses.  Original patch by J Derek Wilson.

- bpo-15101: Make pool finalizer avoid joining current thread.

- bpo-15054: A bug in tokenize.tokenize that caused string literals with 'b'
  and 'br' prefixes to be incorrectly tokenized has been fixed. Patch by
  Serhiy Storchaka.

- bpo-15036: Mailbox no longer throws an error if a flush is done between
  operations when removing or changing multiple items in mbox, MMDF, or
  Babyl mailboxes.

- bpo-10133: Make multiprocessing deallocate buffer if socket read fails.
  Patch by Hallvard B Furuseth.

- bpo-13854: Make multiprocessing properly handle non-integer non-string
  argument to SystemExit.

- bpo-12157: Make pool.map() empty iterables correctly.  Initial patch by
  mouad.

- bpo-14036: Add an additional check to validate that port in urlparse does
  not go in illegal range and returns None.

- bpo-14888: Fix misbehaviour of the _md5 module when called on data larger
  than 2**32 bytes.

- bpo-15908: Fix misbehaviour of the sha1 module when called on data larger
  than 2**32 bytes.

- bpo-15910: Fix misbehaviour of _md5 and sha1 modules when "updating" on
  data larger than 2**32 bytes.

- bpo-14875: Use float('inf') instead of float('1e66666') in the json
  module.

- bpo-14572: Prevent build failures with pre-3.5.0 versions of sqlite3, such
  as was shipped with Centos 5 and Mac OS X 10.4.

- bpo-14426: Correct the Date format in Expires attribute of Set-Cookie
  Header in Cookie.py.

- bpo-14721: Send proper header, Content-length: 0 when the body is an empty
  string ''. Initial Patch contributed by Arve Knudsen.

- bpo-14072: Fix parsing of 'tel' URIs in urlparse by making the check for
  ports stricter.

- bpo-9374: Generic parsing of query and fragment portions of url for any
  scheme. Supported both by RFC3986 and RFC2396.

- bpo-14798: Fix the functions in pyclbr to raise an ImportError when the
  first part of a dotted name is not a package. Patch by Xavier de Gaye.

- bpo-14832: fixed the order of the argument references in the error message
  produced by unittest's assertItemsEqual.

- bpo-14829: Fix bisect issues under 64-bit Windows.

- bpo-14777: tkinter may return undecoded UTF-8 bytes as a string when
  accessing the Tk clipboard.  Modify clipboard_get() to first request type
  UTF8_STRING when no specific type is requested in an X11 windowing
  environment, falling back to the current default type STRING if that
  fails. Original patch by Thomas Kluyver.

- bpo-12541: Be lenient with quotes around Realm field with HTTP Basic
  Authentation in urllib2.

- bpo-14662: Prevent shutil failures on OS X when destination does not
  support chflag operations.  Patch by Hynek Schlawack.

- bpo-14157: Fix time.strptime failing without a year on February 29th.
  Patch by Hynek Schlawack.

- bpo-14768: os.path.expanduser('~/a') doesn't work correctly when HOME is
  '/'.

- bpo-13183: Fix pdb skipping frames after hitting a breakpoint and running
  step.  Patch by Xavier de Gaye.

- bpo-14664: It is now possible to use @unittest.skip{If,Unless} on a test
  class that doesn't inherit from TestCase (i.e. a mixin).

- bpo-14160: TarFile.extractfile() failed to resolve symbolic links when the
  links were not located in an archive subdirectory.

- bpo-14638: pydoc now treats non-string __name__ values as if they were
  missing, instead of raising an error.

- bpo-13684: Fix httplib tunnel issue of infinite loops for certain sites
  which send EOF without trailing \r\n.

- bpo-14308: Fix an exception when a "dummy" thread is in the threading
  module's active list after a fork().

- bpo-14538: HTMLParser can now parse correctly start tags that contain a
  bare '/'.

- bpo-14452: SysLogHandler no longer inserts a UTF-8 BOM into the message.

- bpo-13496: Fix potential overflow in bisect.bisect algorithm when applied
  to a collection of size > sys.maxsize / 2.

- bpo-14399: zipfile now recognizes that the archive has been modified even
  if only the comment is changed.  As a consequence of this fix, ZipFile is
  now a new style class.

- bpo-7978: SocketServer now restarts the select() call when EINTR is
  returned.  This avoids crashing the server loop when a signal is received.
  Patch by Jerzy Kozera.

- bpo-10340: asyncore - properly handle EINVAL in dispatcher constructor on
  OSX; avoid to call handle_connect in case of a disconnected socket which
  was not meant to connect.

- bpo-12757: Fix the skipping of doctests when python is run with -OO so
  that it works in unittest's verbose mode as well as non-verbose mode.

- bpo-13694: asynchronous connect in asyncore.dispatcher does not set addr
  attribute.

- bpo-10484: Fix the CGIHTTPServer's PATH_INFO handling problem.

- bpo-11199: Fix the with urllib which hangs on particular ftp urls.

- bpo-14252: Fix subprocess.Popen.terminate() to not raise an error under
  Windows when the child process has already exited.

- bpo-14195: An issue that caused weakref.WeakSet instances to incorrectly
  return True for a WeakSet instance 'a' in both 'a < a' and 'a > a' has
  been fixed.

- bpo-14159: Fix the len() of weak sets to return a better approximation
  when some objects are dead or dying.  Moreover, the implementation is now
  O(1) rather than O(n).

- bpo-2945: Make the distutils upload command aware of bdist_rpm products.

- bpo-6884: Fix long-standing bugs with MANIFEST.in parsing in distutils on
  Windows.

- bpo-16441: Avoid excessive memory usage working with large gzip files
  using the gzip module.

- bpo-15782: Prevent compile errors of OS X Carbon modules _Fm, _Qd, and
  _Qdoffs when compiling with an SDK of 10.7 or later.  The OS X APIs they
  wrap have long been deprecated and have now been removed with 10.7. These
  modules were already empty for 64-bit builds and have been removed in
  Python 3.

- bpo-17477: Update the bsddb module to pybsddb 5.3.0, supporting db-5.x,
  and dropping support for db-4.1 and db-4.2.

- bpo-17192: Update the ctypes module's libffi to v3.0.13.  This
  specifically addresses a stack misalignment issue on x86 and issues on
  some more recent platforms.

- bpo-12268: The io module file object write methods no longer abort early
  when a write system calls is interrupted (EINTR).

- Fix the leak of a dict in the time module when used in an embedded
  interpreter that is repeatedly initialized and shutdown and reinitialized.

- bpo-12268: File readline, readlines and read or readall methods no longer
  lose data when an underlying read system call is interrupted within an io
  module object.  IOError is no longer raised due to a read system call
  returning EINTR from within these methods.

- bpo-16012: Fix a regression in pyexpat. The parser's UseForeignDTD()
  method doesn't require an argument again.

- bpo-13590: OS X Xcode 4 - improve support for universal extension modules
  In particular, fix extension module build failures when trying to use
  32-bit-only installer Pythons on systems with Xcode 4 (currently OS X
  10.8, 10.7, and optionally 10.6). * Backport 3.3.0 fixes to 2.7 branch
  (for release in 2.7.4) * Since Xcode 4 removes ppc support, extension
  module builds now check for ppc compiler support and by default remove ppc
  and ppc64 archs when they are not available. * Extension module builds now
  revert to using system installed   headers and libs (/usr and
  /System/Library) if the SDK used   to build the interpreter is not
  installed or has moved. * Try to avoid building extension modules with
  deprecated and problematic Apple llvm-gcc compiler.  If original compiler
  is not available, use clang instead by default.

IDLE
----

- IDLE was displaying spurious SystemExit tracebacks when running scripts
  that terminated by raising SystemExit (i.e. unittest and turtledemo).

- bpo-9290: In IDLE the sys.std* streams now implement io.TextIOBase
  interface and support all mandatory methods and properties.

- bpo-16829: IDLE printing no longer fails if there are spaces or other
  special characters in the file path.

- bpo-16819: IDLE method completion now correctly works for unicode
  literals.

- bpo-16504: IDLE now catches SyntaxErrors raised by tokenizer. Patch by
  Roger Serwy.

- bpo-1207589: Add Cut/Copy/Paste items to IDLE right click Context Menu.
  Patch by Todd Rovito.

- bpo-13052: Fix IDLE crashing when replace string in Search/Replace dialog
  ended with '\'. Patch by Roger Serwy.

- bpo-9803: Don't close IDLE on saving if breakpoint is open. Patch by Roger
  Serwy.

- bpo-14958: Change IDLE systax highlighting to recognize all string and
  byte literals currently supported in Python 2.7.

- bpo-14962: Update text coloring in IDLE shell window after changing
  options.  Patch by Roger Serwy.

- bpo-10997: Prevent a duplicate entry in IDLE's "Recent Files" menu.

- bpo-12510: Attempting to get invalid tooltip no longer closes IDLE.
  Original patch by Roger Serwy.

- bpo-10365: File open dialog now works instead of crashing even when parent
  window is closed. Patch by Roger Serwy.

- bpo-14876: Use user-selected font for highlight configuration. Patch by
  Roger Serwy.

- bpo-14409: IDLE now properly executes commands in the Shell window when it
  cannot read the normal config files on startup and has to use the built-in
  default key bindings. There was previously a bug in one of the defaults.

- bpo-3573: IDLE hangs when passing invalid command line args
  (directory(ies) instead of file(s)) (Patch by Guilherme Polo)

- bpo-5219: Prevent event handler cascade in IDLE.

- bpo-15318: Prevent writing to sys.stdin.

- bpo-13532: Check that arguments to sys.stdout.write are strings. (See
  also: bpo-15319)

- bpo-10365: File open dialog now works instead of crashing even when parent
  window is closed while dialog is open.

- bpo-14018: Update checks for unstable system Tcl/Tk versions on OS X to
  include versions shipped with OS X 10.7 and 10.8 in addition to 10.6.

- bpo-15853: Prevent IDLE crash on OS X when opening Preferences menu with
  certain versions of Tk 8.5.  Initial patch by Kevin Walzer.

Tests
-----

- bpo-16702: test_urllib2_localnet tests now correctly ignores proxies for
  localhost tests.

- bpo-13447: Add a test file to host regression tests for bugs in the
  scripts found in the Tools directory.

- bpo-11420: make test suite pass with -B/DONTWRITEBYTECODE set. Initial
  patch by Thomas Wouters.

- bpo-17299: Add test coverage for cPickle with file objects and general IO
  objects. Original patch by Aman Shah.

- bpo-11963: remove human verification from test_parser and test_subprocess.

- bpo-17249: convert a test in test_capi to use unittest and reap threads.

- We now run both test_email.py and test_email_renamed.py when running the
  test_email regression test.  test_email_renamed contains some tests that
  test_email does not.

- bpo-17041: Fix testing when Python is configured with the
  --without-doc-strings option.

- bpo-15539: Added regression tests for Tools/scripts/pindent.py.

- bpo-15324: Fix regrtest parsing of --fromfile and --randomize options.

- bpo-16618: Add more regression tests for glob. Patch by Serhiy Storchaka.

- bpo-16664: Add regression tests for glob's behaviour concerning entries
  starting with a ".".  Patch by Sebastian Kreft.

- bpo-15747: ZFS always returns EOPNOTSUPP when attempting to set the
  UF_IMMUTABLE flag (via either chflags or lchflags); refactor affected
  tests in test_posix.py to account for this.

- bpo-16549: Add tests for json.tools.  Initial patch by Berker Peksag and
  Serhiy Storchaka.

- bpo-16559: Add more tests for the json module, including some from the
  official test suite at json.org.  Patch by Serhiy Storchaka.

- bpo-16274: Fix test_asyncore on Solaris.  Patch by Giampaolo Rodola'.

- bpo-15040: Close files in mailbox tests for PyPy compatibility. Original
  patch by Matti Picus.

- bpo-15802: Fix test logic in TestMaildir.test_create_tmp. Patch by Serhiy
  Storchaka.

- bpo-15765: Extend a previous fix to Solaris and OpenBSD for quirky
  getcwd() behaviour (issue #9185) to NetBSD as well.

- bpo-15615: Add some tests for the json module's handling of invalid input
  data.  Patch by Kushal Das.

- bpo-15496: Add directory removal helpers for tests on Windows. Patch by
  Jeremy Kloth.

- bpo-15043: test_gdb is now skipped entirely if gdb security settings block
  loading of the gdb hooks

- bpo-14589: Update certificate chain for sha256.tbs-internet.com, fixing a
  test failure in test_ssl.

- bpo-16698: Skip posix test_getgroups when built with OS X deployment
  target prior to 10.6.

- bpo-17111: Prevent test_surrogates (test_fileio) failure on OS X 10.4.

Build
-----

- bpo-17425: Build against openssl 0.9.8y on Windows.

- bpo-16004: Add `make touch`.

- bpo-5033: Fix building of the sqlite3 extension module when the SQLite
  library version has "beta" in it. Patch by Andreas Pelme.

- bpo-17228: Fix building without pymalloc.

- bpo-17086: Backport the patches from the 3.3 branch to cross-build the
  package.

- bpo-3754: fix typo in pthread AC_CACHE_VAL.

- bpo-17029: Let h2py search the multiarch system include directory.

- bpo-16953: Fix socket module compilation on platforms with
  HAVE_BROKEN_POLL. Patch by Jeffrey Armstrong.

- bpo-16836: Enable IPv6 support even if IPv6 is disabled on the build host.

- bpo-15923: fix a mistake in asdl_c.py that resulted in a TypeError after
  2801bf875a24 (see #15801).

- bpo-11715: Fix multiarch detection without having Debian development tools
  (dpkg-dev) installed.

- bpo-15819: Make sure we can build Python out-of-tree from a readonly
  source directory. (Somewhat related to Issue #9860.)

- bpo-15822: Ensure 2to3 grammar pickles are properly installed.

- bpo-15560: Fix building _sqlite3 extension on OS X with an SDK.

- bpo-8847: Disable COMDAT folding in Windows PGO builds.

- bpo-14018: Fix OS X Tcl/Tk framework checking when using OS X SDKs.

- bpo-16256: OS X installer now sets correct permissions for doc directory.

- bpo-8767: Restore building with --disable-unicode. Patch by Stefano
  Taschini.

- Build against bzip2 1.0.6 and openssl 0.9.8x on Windows.

- bpo-14557: Fix extensions build on HP-UX. Patch by Adi Roiban.

- bpo-14437: Fix building the _io module under Cygwin.

- bpo-15587: Enable Tk high-resolution text rendering on Macs with Retina
  displays. Applies to Tkinter apps, such as IDLE, on OS X framework builds
  linked with Cocoa Tk 8.5.

- bpo-17161: make install now also installs a python2 and python man page.

- bpo-16848: python-config now returns proper --ldflags values for OS X
  framework builds.

Tools/Demos
-----------

- bpo-17156: pygettext.py now correctly escapes non-ascii characters.

- bpo-15539: Fix a number of bugs in Tools/scripts/pindent.py.  Now
  pindent.py works with a "with" statement.  pindent.py no longer produces
  improper indentation. pindent.py now works with continued lines broken
  after "class" or "def" keywords and with continuations at the start of
  line.

- bpo-16476: Fix json.tool to avoid including trailing whitespace.

- bpo-13301: use ast.literal_eval() instead of eval() in
  Tools/i18n/msgfmt.py. Patch by Serhiy Storchaka.

Documentation
-------------

- bpo-15041: Update "see also" list in tkinter documentation.

- bpo-17412: update 2.7 Doc/make.bat to also use sphinx-1.0.7.

- bpo-17047: remove doubled words in docs and docstrings reported by Serhiy
  Storchaka and Matthew Barnett.

- bpo-16406: combine the pages for uploading and registering to PyPI.

- bpo-16403: Document how distutils uses the maintainer field in PKG-INFO.
  Patch by Jyrki Pulliainen.

- bpo-16695: Document how glob handles filenames starting with a dot.
  Initial patch by Jyrki Pulliainen.

- bpo-8890: Stop advertising an insecure practice by replacing uses of the
  /tmp directory with better alternatives in the documentation. Patch by
  Geoff Wilson.

- bpo-17203: add long option names to unittest discovery docs.

- bpo-13094: add "Why do lambdas defined in a loop with different values all
  return the same result?" programming FAQ.

- bpo-14901: Update portions of the Windows FAQ. Patch by Ashish Nitin
  Patil.

- bpo-15990: Improve argument/parameter documentation.

- bpo-16400: Update the description of which versions of a given package
  PyPI displays.

- bpo-15677: Document that zlib and gzip accept a compression level of 0 to
  mean 'no compression'. Patch by Brian Brazil.

- bpo-8040: added a version switcher to the documentation.  Patch by Yury
  Selivanov.

- bpo-16115: Improve subprocess.Popen() documentation around args, shell,
  and executable arguments.

- bpo-15979: Improve timeit documentation.

- bpo-16036: Improve documentation of built-in int()'s signature and
  arguments.

- bpo-15935: Clarification of argparse docs, re: add_argument() type and
  default arguments.  Patch contributed by Chris Jerdonek.

- bpo-13769: Document the effect of ensure_ascii to the return type of JSON
  decoding functions.

- bpo-14880: Fix kwargs notation in csv.reader, .writer & .register_dialect.
  Patch by Chris Rebert.

- bpo-14674: Add a discussion of the json module's standard compliance.
  Patch by Chris Rebert.

- bpo-15630: Add an example for "continue" stmt in the tutorial. Patch by
  Daniel Ellis.

- bpo-13557: Clarify effect of giving two different namespaces to exec or
  execfile().

- bpo-14034: added the argparse tutorial.

- bpo-15250: Document that filecmp.dircmp compares files shallowly. Patch
  contributed by Chris Jerdonek.

- bpo-15116: Remove references to appscript as it is no longer being
  supported.


What's New in Python 2.7.3 release candidate 2?
===============================================

*Release date: 2012-03-17*

Library
-------

- bpo-14234: CVE-2012-0876: Randomize hashes of xml attributes in the hash
  table internal to the pyexpat module's copy of the expat library to avoid
  a denial of service due to hash collisions.  Patch by David Malcolm with
  some modifications by the expat project.


What's New in Python 2.7.3 release candidate 1?
===============================================
<