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URL: http://github.com/python/cpython/pull/142101/files

ous" media="all" rel="stylesheet" href="https://github.githubassets.com/assets/code-2d31826944fd3be8.css" /> gh-141473: Document not calling Popen.wait after Popen.communicate times out. by gpshead · Pull Request #142101 · python/cpython · GitHub
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gh-141473: Document not calling Popen.wait after Popen.communicate times out. #142101

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gpshead merged 1 commit into from
Dec 1, 2025
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gh-141473: Document not calling Popen.wait after Popen.communicate times out. #142101

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5 changes: 5 additions & 0 deletions Doc/library/subprocess.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -846,6 +846,11 @@ Instances of the :class:`Popen` class have the following methods:
proc.kill()
outs, errs = proc.communicate()

After a call to :meth:`~Popen.communicate` raises :exc:`TimeoutExpired`, do
not call :meth:`~Popen.wait`. Use an additional :meth:`~Popen.communicate`
call to finish handling pipes and populate the :attr:`~Popen.returncode`
attribute.

.. note::

The data read is buffered in memory, so do not use this method if the data
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