[issue18301] In itertools.chain.from_iterable() there is no cls argument

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

It should be a classmethod.

>>> import itertools
>>> class C(itertools.chain): pass
... 
>>> type(C.from_iterable(['ab', 'cd']))
<class '__main__.C'>

The patch LGTM.

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assignee: docs at python -> serhiy.storchaka
stage:  -> commit review

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18301>
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