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[3.11] gh-87452: Improve the Popen.returncode docs #103771

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ambv merged 2 commits into from
Apr 25, 2023
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[3.11] gh-87452: Improve the Popen.returncode docs #103771

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gh-87452: Improve the Popen.returncode docs
zitterbewegung Apr 24, 2023
e9e42f9
Merge branch '3.11' into backport-68f5836-3.11
ambv Apr 25, 2023
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gh-87452: Improve the Popen.returncode docs 
Clarifies that it remains None until a method checking the child process status has been called and noticed it has terminated.
(cherry picked from commit 68f5836)

Co-authored-by: Joshua Herman <30265+zitterbewegung@users.noreply.github.com>
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@zitterbewegung @miss-islington
zitterbewegung authored and miss-islington committed Apr 24, 2023
commit b050c154a7b8fad76ccfd295010a3b24b69e1dd6
9 changes: 6 additions & 3 deletions Doc/library/subprocess.rst
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Expand Up @@ -921,9 +921,12 @@ Reassigning them to new values is unsupported:

.. attribute:: Popen.returncode

The child return code, set by :meth:`poll` and :meth:`wait` (and indirectly
by :meth:`communicate`). A ``None`` value indicates that the process
hasn't terminated yet.
The child return code. Initially ``None``, :attr:`returncode` is set by
a call to the :meth:`poll`, :meth:`wait`, or :meth:`communicate` methods
if they detect that the process has terminated.

A ``None`` value indicates that the process hadn't yet terminated at the
time of the last method call.

A negative value ``-N`` indicates that the child was terminated by signal
``N`` (POSIX only).
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