[issue17914] add os.cpu_count()

[Yogesh Chaudhari]

Yogesh Chaudhari added the comment:

Based on the last 3 messages by Ned, Charles and Antoine, I keep thinking that arguments made by Charles are very valid ones and that it would be better to return 1. I say this (partly from the 'type' argument, but), mainly, *if* its known that the underlying libraries are returning 1 on failure. *If* that is the case I see no reason try to return None (which, btw, will never happen if none of the calls return non-positive values ever).

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