[issue17914] add os.cpu_count()

[Ned Batchelder]

Ned Batchelder added the comment:

A few small points:

Use `num is None` instead of `num == None`.

Use `isinstance(cpus, int)` rather than `type(cpus) is int`.

And this I think will throw an exception in Python 3: `cpus >= 1 or cpus == None`, because you can't compare None to 1.

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<http://bugs.python.org/issue17914>
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