Issue #10029: Fix sample code in the docs for zip().

This commit is contained in:
Raymond Hettinger 2010-10-10 05:56:57 +00:00
parent ae136da881
commit 066e7a974a
1 changed files with 12 additions and 5 deletions

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@ -1220,11 +1220,18 @@ are always available. They are listed here in alphabetical order.
iterable argument, it returns an iterator of 1-tuples. With no arguments,
it returns an empty iterator. Equivalent to::
def zip(*iterables):
# zip('ABCD', 'xy') --> Ax By
iterables = map(iter, iterables)
while iterables:
yield tuple(map(next, iterables))
def zip(*iterables):
# zip('ABCD', 'xy') --> Ax By
sentinel = object()
iterables = [iter(it) for it in iterables]
while iterables:
result = []
for it in iterables:
elem = next(it, sentinel)
if elem is sentinel:
return
result.append(elem)
yield tuple(result)
The left-to-right evaluation order of the iterables is guaranteed. This
makes possible an idiom for clustering a data series into n-length groups