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[3.8] bpo-40707: Document that Popen.communicate sets the returncode attribute (GH-20283) #21106

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miss-islington merged 1 commit into from
Jun 24, 2020
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[3.8] bpo-40707: Document that Popen.communicate sets the returncode attribute (GH-20283) #21106

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9 changes: 5 additions & 4 deletions Doc/library/subprocess.rst
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Expand Up @@ -704,10 +704,11 @@ Instances of the :class:`Popen` class have the following methods:
.. method:: Popen.communicate(input=None, timeout=None)

Interact with process: Send data to stdin. Read data from stdout and stderr,
until end-of-file is reached. Wait for process to terminate. The optional
*input* argument should be data to be sent to the child process, or
``None``, if no data should be sent to the child. If streams were opened in
text mode, *input* must be a string. Otherwise, it must be bytes.
until end-of-file is reached. Wait for process to terminate and set the
:attr:`~Popen.returncode` attribute. The optional *input* argument should be
data to be sent to the child process, or ``None``, if no data should be sent
to the child. If streams were opened in text mode, *input* must be a string.
Otherwise, it must be bytes.

:meth:`communicate` returns a tuple ``(stdout_data, stderr_data)``.
The data will be strings if streams were opened in text mode; otherwise,
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