Richard Oudkerk added the comment:

This problem also affects processes started by multiprocessing (although it is 
fixed in http://hg.python.org/sandbox/sbt#spawn).

As far as I am concerned O_NOINHERIT should really have been applied by default 
in Python 3.  You only get inheritable fds on Windows if you use the msvcrt's 
spawn*() functions.  But in Python 3 os.spawn*() is implemented on top of 
subprocess so the fds are never inherited (even if the underlying handles are).

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue17634>
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