[issue17914] add os.cpu_count()

[Ned Batchelder]

Ned Batchelder added the comment:

Python's goal is not to emulate the suboptimal parts of other languages.  We have dynamic typing, and so can return None from the same function that returns 1.  And we have compact expressions like `cpu_count() or 1`, so we don't have to make unfortunate compromises.

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