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Add recipe to itertools doc.

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Raymond Hettinger 2010-12-01 10:49:19 +00:00
parent c79fb0e52d
commit 5ce0aa236f
1 changed files with 8 additions and 0 deletions
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8
Doc/library/itertools.rst
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@ -653,6 +653,14 @@ which incur interpreter overhead.
pending -= 1 pending -= 1
nexts = cycle(islice(nexts, pending)) nexts = cycle(islice(nexts, pending))
def accumulate(iterable):
'Emit a running total'
# accumulate([1,2,3,4,5]) --> 1 3 6 10 15
total = 0
for element in iterable:
total += element
yield total
def partition(pred, iterable): def partition(pred, iterable):
'Use a predicate to partition entries into false entries and true entries' '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 # partition(is_odd, range(10)) --> 0 2 4 6 8 and 1 3 5 7 9