bpo-31065: Add doc about Popen.poll returning None. (#3169) · python/cpython@006617f

bpo-31065: Add doc about Popen.poll returning None. (#3169) · python/cpython@006617f

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

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- subprocess.rst

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`‎Doc/library/subprocess.rst‎`

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Original file line number	Diff line number	Diff line change
@@ -584,7 +584,7 @@ Instances of the :class:`Popen` class have the following methods:
`584`	`584`	`.. method:: Popen.poll()`
`585`	`585`
`586`	`586`	`Check if child process has terminated. Set and return`
`587`		-:attr:`~Popen.returncode` attribute.
	`587`	+:attr:`~Popen.returncode` attribute. Otherwise, returns ``None``.
`588`	`588`
`589`	`589`
`590`	`590`	`.. method:: Popen.wait(timeout=None)`

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