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Tue Aug 6 02:59:45 CEST 2013 · https://mail.python.org/pipermail/python-dev/2013-August/127809.html

> On Windows, the ``subprocess`` closes all handles and file descriptors
> in the child process by default. If at least one standard stream (stdin,
> stdout or stderr) is replaced (ex: redirected into a pipe), all
> inheritable handles are inherited in the child process.
>
> Summary:
>
> ===========================  =============  ==================  =============
> Module                       FD on UNIX     Handles on Windows  FD on Windows
> ===========================  =============  ==================  =============
> subprocess, default          STD, pass_fds  none                STD

Oh, the summary table is wrong for the "subprocess, default" line: all
inheritable handles are inherited if at least one standard stream is
replaced.

Victor

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Showing content from https://mail.python.org/pipermail/python-dev/2013-August/127809.html below:

Make newly created file descriptors non-inheritable