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bpo-36760: Clarify subprocess capture_output docs. (GH-13322) 

Clarify how to capture stdout and stderr combined into one stream.
(cherry picked from commit e883091abf)

Co-authored-by: Gregory P. Smith <greg@krypto.org>
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Miss Islington (bot) 2019-05-14 12:39:17 -07:00 committed by GitHub
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Doc/library/subprocess.rst
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@ -55,7 +55,9 @@ compatibility with older versions, see the :ref:`call-function-trio` section.
If *capture_output* is true, stdout and stderr will be captured.
When used, the internal :class:`Popen` object is automatically created with
``stdout=PIPE`` and ``stderr=PIPE``. The *stdout* and *stderr* arguments may
not be supplied at the same time as *capture_output*.
not be supplied at the same time as *capture_output*. If you wish to capture
and combine both streams into one, use ``stdout=PIPE`` and ``stderr=STDOUT``
instead of *capture_output*.
The *timeout* argument is passed to :meth:`Popen.communicate`. If the timeout
expires, the child process will be killed and waited for. The