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

Document not calling Popen.wait after Popen.communicate times out.

Closes #141473

diff --git a/Doc/library/subprocess.rst b/Doc/library/subprocess.rst
index 43da804b62beb15aa41aba43ee964a3ac099e007..b8dfcc310771fe0b7ebcf31300e4b20022b1cc72 100644 (file)
--- 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