krsna <kes...@gmail.com> added the comment:

Closing has behavior is documented "The file descriptor created by "os.dup" is 
not inherited by child processes by default since Python 3.4.
https://docs.python.org/3/library/os.html#os.dup";

----------
resolution:  -> not a bug
stage:  -> resolved
status: open -> closed

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue40299>
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