Add partition recipe to itertools docs.
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@ -653,6 +653,12 @@ which incur interpreter overhead.
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pending -= 1
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nexts = cycle(islice(nexts, pending))
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def partition(pred, iterable):
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'Use a predicate to partition entries into false entries and true entries'
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# partition(is_odd, range(10)) --> 0 2 4 6 8 and 1 3 5 7 9
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t1, t2 = tee(iterable)
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return filterfalse(pred, t1), filter(pred, t2)
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def powerset(iterable):
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"powerset([1,2,3]) --> () (1,) (2,) (3,) (1,2) (1,3) (2,3) (1,2,3)"
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s = list(iterable)
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