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itertools.py
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itertools.py
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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
from __future__ import absolute_import
import itertools
if hasattr(itertools, 'izip_longest'):
izip_longest = itertools.izip_longest
else:
class ZipExhausted(Exception):
pass
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