[issue7447] Sum() doc and behavior mismatch

[Georg Brandl]

Georg Brandl <georg at python.org> added the comment:

Note that using `~itertools.chain.from_iterable` is equivalent to `from_iterable <itertools.chain.from_iterable>` and saves a repetition.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue7447>
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