New submission from David Lindquist:
The roundrobin example in the Recipes section of the itertools documentation
(http://docs.python.org/3/library/itertools.html#itertools-recipes) is overly
complex. Here is a more straightforward implementation:
def roundrobin(*iterables):
"roundrobin('ABC', 'D', 'EF') --> A D E B F C"
sentinel = object()
it = chain.from_iterable(zip_longest(fillvalue=sentinel, *iterables))
return (i for i in it if i is not sentinel)
Not only is it one-third the lines of the existing example, benchmarks show it
to be more than twice as fast.
See attached patch file.
----------
assignee: docs@python
components: Documentation
files: roundrobin.patch
keywords: patch
messages: 211907
nosy: david.lindquist, docs@python
priority: normal
severity: normal
status: open
title: Improved roundrobin itertools recipe
versions: Python 2.7, Python 3.1, Python 3.2, Python 3.3, Python 3.4, Python 3.5
Added file: http://bugs.python.org/file34180/roundrobin.patch
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue20727>
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