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Authored by awight on Mar 20 2018, 6:44 PM.

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	Mar 20 2018, 6:44 PM

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	Python 3.6.2 (v3.6.2:5fd33b5926, Jul 16 2017, 20:11:06)
	[GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin
	Type "help", "copyright", "credits" or "license" for more information.
	>>> from collections import defaultdict
	>>> l=defaultdict(list)
	>>> l['foo']
	[]
	>>> 'foo' in l
	True
	>>> 'bar' in l
	False

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awight created this paste.Mar 20 2018, 6:44 PM