jaraco/itertools.py
def window(iter, pre_size=1, post_size=1):
	"""
	Given an iterable, return a new iterable which yields triples of
	(pre, item, post), where pre and post are the items preceeding and
	following the item (or None if no such item is appropriate). pre
	and post will always be pre_size and post_size in length.

	>>> example = window(range(10), pre_size=2)
	>>> pre, item, post = next(example)
	>>> pre
	(None, None)
	>>> post
	(1,)
	>>> next(example)
	((None, 0), 1, (2,))
	>>> list(example)[-1]
	((7, 8), 9, (None,))
	"""
	pre_iter, iter = itertools.tee(iter)
	pre_iter = itertools.chain((None,) * pre_size, pre_iter)
	pre_iter = nwise(pre_iter, pre_size)
	post_iter, iter = itertools.tee(iter)
	post_iter = itertools.chain(post_iter, (None,) * post_size)
	post_iter = nwise(post_iter, post_size)
	next(post_iter, None)
	return six.moves.zip(pre_iter, iter, post_iter)
def window(iter, pre_size=1, post_size=1):
	"""
	Given an iterable, return a new iterable which yields triples of
	(pre, item, post), where pre and post are the items preceeding and
	following the item (or None if no such item is appropriate). pre
	and post will always be pre_size and post_size in length.

	>>> example = window(range(10), pre_size=2)
	>>> pre, item, post = next(example)
	>>> pre
	(None, None)
	>>> post
	(1,)
	>>> next(example)
	((None, 0), 1, (2,))
	>>> list(example)[-1]
	((7, 8), 9, (None,))
	"""
	pre_iter, iter = itertools.tee(iter)
	pre_iter = itertools.chain((None,) * pre_size, pre_iter)
	pre_iter = nwise(pre_iter, pre_size)
	post_iter, iter = itertools.tee(iter)
	post_iter = itertools.chain(post_iter, (None,) * post_size)
	post_iter = nwise(post_iter, post_size)
	next(post_iter, None)
	return six.moves.zip(pre_iter, iter, post_iter)
def window ( iter , pre_size = 1 , post_size = 1 ) : pre_iter , iter = itertools . tee ( iter ) pre_iter = itertools . chain ( ( None , ) * pre_size , pre_iter ) pre_iter = nwise ( pre_iter , pre_size ) post_iter , iter = itertools . tee ( iter ) post_iter = itertools . chain ( post_iter , ( None , ) * post_size ) post_iter = nwise ( post_iter , post_size ) next ( post_iter , None ) return six . moves . zip ( pre_iter , iter , post_iter )
Given an iterable, return a new iterable which yields triples of
	(pre, item, post), where pre and post are the items preceeding and
	following the item (or None if no such item is appropriate). pre
	and post will always be pre_size and post_size in length.

	>>> example = window(range(10), pre_size=2)
	>>> pre, item, post = next(example)
	>>> pre
	(None, None)
	>>> post
	(1,)
	>>> next(example)
	((None, 0), 1, (2,))
	>>> list(example)[-1]
	((7, 8), 9, (None,))
Given an iterable return a new iterable which yields triples of ( pre item post ) where pre and post are the items preceeding and following the item ( or None if no such item is appropriate ) . pre and post will always be pre_size and post_size in length .