Gregory P. Smith <g...@krypto.org> added the comment:

I assumed simon meant "close_fds=False" when he wrote open_fds = True.

Regardless, supplying any pass_fds forces close_fds=True behavior.

File descriptors listed in pass_fds are explicitly set inheritable from within 
the child process prior to calling exec().  See the start of child_exec() 
within Modules/_posixsubprocess.c.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue33079>
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