[3.9] bpo-42388: Fix subprocess.check_output input=None when text=True (GH-23467)#23934
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…honGH-23467) When the modern text= spelling of the universal_newlines= parameter was added for Python 3.7, check_output's special case around input=None was overlooked. So it behaved differently with universal_newlines=True vs text=True. This reconciles the behavior to be consistent and adds a test to guarantee it. Also clarifies the existing check_output documentation. Co-authored-by: Alexey Izbyshev <izbyshev@ispras.ru> (cherry picked from commit 64abf37) Co-authored-by: Gregory P. Smith <greg@krypto.org>
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When the modern text= spelling of the universal_newlines= parameter was added
for Python 3.7, check_output's special case around input=None was overlooked.
So it behaved differently with universal_newlines=True vs text=True. This
reconciles the behavior to be consistent and adds a test to guarantee it.
Also clarifies the existing check_output documentation.
Co-authored-by: Alexey Izbyshev izbyshev@ispras.ru
(cherry picked from commit 64abf37)
Co-authored-by: Gregory P. Smith greg@krypto.org
https://bugs.python.org/issue42388
Automerge-Triggered-By: GH:gpshead