[3.14] gh-141570: can_colorize: Expect fileno() to raise OSError, as documented (GH-141716)#141747
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vstinner merged 1 commit intopython:3.14from Nov 19, 2025
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…ocumented (pythonGH-141716) In Fedora, we've been given a slightly incomplete reproducer for a problematic Python 3.14 color-related change in argparse that leads to an exception when Python is used from mod_wsgi: https://bugzilla.redhat.com/2414940 mod_wsgi replaces sys.stdout with a custom object that raises OSError on .fileno(): https://github.com/GrahamDumpleton/mod_wsgi/blob/8460dbfcd5c7108892b3cde9fab7cbc1caa27886/src/server/wsgi_logger.c#L434-L440 This should be supported, as the documentation of fileno explicitly says: > An OSError is raised if the IO object does not use a file descriptor. https://docs.python.org/3.14/library/io.html#io.IOBase.fileno The previously expected exception inherits from OSError, so it is still expected. Fixes python#141570 (cherry picked from commit 96f496a) Co-authored-by: Miro Hrončok <miro@hroncok.cz> Co-authored-by: Cody Maloney <cmaloney@users.noreply.github.com> Co-authored-by: Victor Stinner <vstinner@python.org>
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Nov 19, 2025
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In Fedora, we've been given a slightly incomplete reproducer for a problematic
Python 3.14 color-related change in argparse that leads to an exception when
Python is used from mod_wsgi: https://bugzilla.redhat.com/2414940
mod_wsgi replaces sys.stdout with a custom object that raises OSError on .fileno():
https://github.com/GrahamDumpleton/mod_wsgi/blob/8460dbfcd5c7108892b3cde9fab7cbc1caa27886/src/server/wsgi_logger.c#L434-L440
This should be supported, as the documentation of fileno explicitly says:
https://docs.python.org/3.14/library/io.html#io.IOBase.fileno
The previously expected exception inherits from OSError,
so it is still expected.
Fixes #141570
(cherry picked from commit 96f496a)
Co-authored-by: Miro Hrončok miro@hroncok.cz
Co-authored-by: Cody Maloney cmaloney@users.noreply.github.com
Co-authored-by: Victor Stinner vstinner@python.org