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tef / gist:3688778

Created September 10, 2012 03:52 — forked from dstufft/gist:3688725

	import collections

	def flatten(input, seen=None):
	for item in input:
	if isinstance(item, collections.Iterable):
	for sub in flatten(item):
	yield sub
	else:
	yield item

tef / gist:3688768

Created September 10, 2012 03:50 — forked from dstufft/gist:3688762

	import collections

	def flatten(input):
	stack = list(reversed(input))
	while stack:
	top = stack.pop()
	if isinstance(top, collections.Iterable):
	stack.extend(list(reversed(top)))
	else:
	yield top