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"""Internal module for Python 2 backwards compatibility."""
import sys
if sys.version_info[0] < 3:
from urllib import unquote
from urlparse import parse_qs, urlparse
from itertools import imap, izip
from string import letters as ascii_letters
from Queue import Queue
try:
from cStringIO import StringIO as BytesIO
except ImportError:
from StringIO import StringIO as BytesIO
# special unicode handling for python2 to avoid UnicodeDecodeError
def safe_unicode(obj, *args):
""" return the unicode representation of obj """
try:
return unicode(obj, *args)
except UnicodeDecodeError:
# obj is byte string
ascii_text = str(obj).encode('string_escape')
return unicode(ascii_text)
def iteritems(x):
return x.iteritems()
def iterkeys(x):
return x.iterkeys()
def itervalues(x):
return x.itervalues()
def nativestr(x):
return x if isinstance(x, str) else x.encode('utf-8', 'replace')
def u(x):
return x.decode()
def b(x):
return x
def next(x):
return x.next()
def byte_to_chr(x):
return x
unichr = unichr
xrange = xrange
basestring = basestring
unicode = unicode
bytes = str
long = long
else:
from urllib.parse import parse_qs, unquote, urlparse
from io import BytesIO
from string import ascii_letters
from queue import Queue
def iteritems(x):
return iter(x.items())
def iterkeys(x):
return iter(x.keys())
def itervalues(x):
return iter(x.values())
def byte_to_chr(x):
return chr(x)
def nativestr(x):
return x if isinstance(x, str) else x.decode('utf-8', 'replace')
def u(x):
return x
def b(x):
return x.encode('latin-1') if not isinstance(x, bytes) else x
next = next
unichr = chr
imap = map
izip = zip
xrange = range
basestring = str
unicode = str
safe_unicode = str
bytes = bytes
long = int
try: # Python 3
from queue import LifoQueue, Empty, Full
except ImportError:
from Queue import Empty, Full
try: # Python 2.6 - 2.7
from Queue import LifoQueue
except ImportError: # Python 2.5
from Queue import Queue
# From the Python 2.7 lib. Python 2.5 already extracted the core
# methods to aid implementating different queue organisations.
class LifoQueue(Queue):
"Override queue methods to implement a last-in first-out queue."
def _init(self, maxsize):
self.maxsize = maxsize
self.queue = []
def _qsize(self, len=len):
return len(self.queue)
def _put(self, item):
self.queue.append(item)
def _get(self):
return self.queue.pop()
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