Eryk Sun <eryk...@gmail.com> added the comment:

In Windows the CRT file descriptor is actually still inheritable. This only 
makes the underlying OS handle non-inheritable. I don't think there's a way to 
make an existing FD non-inheritable using public CRT functions. See issue 32865.

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nosy: +eryksun

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue32862>
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