gh-141473: Document not calling Popen.wait after Popen.communicate times out. (GH-142101)

gpshead · web-flow · commit 3e2c55749326 · 2025-11-30T18:50:05.000-08:00
Document not calling Popen.wait after Popen.communicate times out. Closes #141473
diff --git a/Doc/library/subprocess.rst b/Doc/library/subprocess.rst
@@ -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
