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Fri Aug 2 02:21:19 CEST 2013 · https://mail.python.org/pipermail/python-dev/2013-August/127729.html

2013/7/30 Victor Stinner <victor.stinner at gmail.com>:
> I would be nice to have a "pass_handles" on Windows.

I'm not sure that it's possible to implement this atomically. It's
probably better to leave the application to choose how the inheritance
is defined.

Example:

for handle in handles:
    os.set_inheritable(handle, True)
subprocess.call(...)
for handle in handles:
    os.set_inheritable(handle, False)

This example is safe if the application has a single thread (if a
single thread spawn new programs). Making handles non-inheritable
again may be useless.

Victor

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[Python-Dev] PEP 446: Open issues/questions