Serhiy Storchaka added the comment:

> Since the user can't do anything except falling back to 1,
> os.cpu_count() should always return a positive number (1 by default).

In general I agree with you. Actually the os module should contains two 
functions: cpu_count() which fallbacks to 1 and is_cpu_counting_supported() for 
rare need. But this looks even more ugly and I choose single function even if 
in most cases I need use strange idiom.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue17914>
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