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.. _futurize-limitations:
Known limitations
-----------------
``futurize`` and ``pasteurize`` are useful to automate much of the
work of porting, particularly the boring repetitive text substitutions. They also
help to flag which parts of the code require attention.
Nevertheless, ``futurize`` and ``pasteurize`` are still incomplete and make
some mistakes, like 2to3, on which they are based. Please report bugs on
`GitHub <https://github.com/PythonCharmers/python-future/>`_. Contributions to
the ``lib2to3``-based fixers for ``futurize`` and ``pasteurize`` are
particularly welcome! Please see :ref:`contributing`.
``futurize`` doesn't currently make the following change automatically:
1. Strings containing ``\U`` produce a ``SyntaxError`` on Python 3. An example is::
s = 'C:\Users'.
Python 2 expands this to ``s = 'C:\\Users'``, but Python 3 requires a raw
prefix (``r'...'``). This also applies to multi-line strings (including
multi-line docstrings).
Also see the tests in ``future/tests/test_futurize.py`` marked
``@expectedFailure`` or ``@skip`` for known limitations.
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