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add fallback function for itertools.izip_longest for python 2.5 compat
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# missing izip_longest function for Python 2.5 compatibility | ||
# http://docs.python.org/library/itertools.html#itertools.izip_longest | ||
# Copyright 2001-2012 Python Software Foundation; All Rights Reserved | ||
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from __future__ import absolute_import | ||
import itertools | ||
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if hasattr(itertools, 'izip_longest'): | ||
izip_longest = itertools.izip_longest | ||
else: | ||
class ZipExhausted(Exception): | ||
pass | ||
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def izip_longest(*args, **kwds): | ||
# izip_longest('ABCD', 'xy', fillvalue='-') --> Ax By C- D- | ||
fillvalue = kwds.get('fillvalue') | ||
counter = [len(args) - 1] | ||
def sentinel(): | ||
if not counter[0]: | ||
raise ZipExhausted | ||
counter[0] -= 1 | ||
yield fillvalue | ||
fillers = itertools.repeat(fillvalue) | ||
iterators = [itertools.chain(it, sentinel(), fillers) for it in args] | ||
try: | ||
while iterators: | ||
yield tuple(i.next() for i in iterators) | ||
except ZipExhausted: | ||
pass |
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