Eryk Sun added the comment:
> I tried with stdin=subprocess.DEVNULL, stdout=subprocess.DEVNULL,
> stderr=subprocess.DEVNULL
As I said previously, you also need to make the current standard handles
non-inheritable. Pending issue 19764, in 3.7 you'll be able to override stdin,
stdout, and stderr with the default close_fds=True. Currently overriding them
implicitly sets close_fds=False, in which case you need to manually ensure that
the current standard handles (i.e. the pipe handles) can't be inherited. For
example:
os.set_inheritable(0, False)
os.set_inheritable(1, False)
os.set_inheritable(2, False)
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue31447>
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