bpo-31065: Add doc about Popen.poll returning None. (#3169)

006617ff · Ivan Chernoff · Gregory P. Smith · 265fcc5f · 006617ff
Commit 006617ff authored Aug 29, 2017 by Ivan Chernoff Committed by Gregory P. Smith Aug 29, 2017
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Doc/library/subprocess.rst Doc/library/subprocess.rst +1 -1

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--- a/Doc/library/subprocess.rst
+++ b/Doc/library/subprocess.rst
@@ -584,7 +584,7 @@ Instances of the :class:`Popen` class have the following methods:
 .. method:: Popen.poll()

   Check if child process has terminated.  Set and return
-   :attr:`~Popen.returncode` attribute.
+   :attr:`~Popen.returncode` attribute. Otherwise, returns ``None``.


 .. method:: Popen.wait(timeout=None)