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Add partition recipe to itertools docs.

This commit is contained in:
Raymond Hettinger 2010-08-07 05:36:53 +00:00
parent e9499aef0a
commit 08d01eedef
1 changed files with 6 additions and 0 deletions
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6
Doc/library/itertools.rst
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@ -653,6 +653,12 @@ which incur interpreter overhead.
pending -= 1 pending -= 1
nexts = cycle(islice(nexts, pending)) nexts = cycle(islice(nexts, pending))
def partition(pred, iterable):
'Use a predicate to partition entries into false entries and true entries'
# partition(is_odd, range(10)) --> 0 2 4 6 8 and 1 3 5 7 9
t1, t2 = tee(iterable)
return filterfalse(pred, t1), filter(pred, t2)
def powerset(iterable): def powerset(iterable):
"powerset([1,2,3]) --> () (1,) (2,) (3,) (1,2) (1,3) (2,3) (1,2,3)" "powerset([1,2,3]) --> () (1,) (2,) (3,) (1,2) (1,3) (2,3) (1,2,3)"
s = list(iterable) s = list(iterable)