Antoine Pitrou added the comment:

>  * add a os.cpu_count() which returns the raw value (may be zero or
> negative if the OS returns a dummy value) and raise an OSError on
> error
>  * os.cpu_count() is not available on all platforms
>  * shutil.cpu_count() is the high level API using 1 as a fallback. The
> fallback value (which is 1 by default) is configurable, ex:
> shutil.cpu_count(fallback=None) returns None on os.cpu_count() error.

-1. This is simply too complicated for a simple API. Just let
os.cpu_count() return None.

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