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

9 years ago · 006617ff7d
1 changed files with 1 additions and 1 deletions
--- 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)