[issue17914] add os.cpu_count()

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

I think the idiom `os.cpu_count() or 1` should be mentioned in the documentation an officially recommended. Otherwise people will produce a non-portable code which works on their developer's computers but not on exotic platforms.

I have added some other comments on Rietveld.

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nosy: +serhiy.storchaka

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17914>
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