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gh-87452: Improve the Popen.returncode docs

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Clarifies that it remains None until a method checking the child process status has been called and noticed it has terminated.
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Joshua Herman 2023-04-24 10:46:12 -06:00 • committed by GitHub
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Doc/library/subprocess.rst
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@ -919,9 +919,12 @@ Reassigning them to new values is unsupported:
.. attribute:: Popen.returncode .. attribute:: Popen.returncode
The child return code, set by :meth:`poll` and :meth:`wait` (and indirectly The child return code. Initially ``None``, :attr:`returncode` is set by
by :meth:`communicate`). A ``None`` value indicates that the process a call to the :meth:`poll`, :meth:`wait`, or :meth:`communicate` methods
hasn't terminated yet. 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 A negative value ``-N`` indicates that the child was terminated by signal
``N`` (POSIX only). ``N`` (POSIX only).