[3.13] gh-141570: can_colorize: Expect fileno() to raise OSError, as documented (#141716) #141748
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
…ocumented (python#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 Co-authored-by: Cody Maloney <cmaloney@users.noreply.github.com> Co-authored-by: Victor Stinner <vstinner@python.org> (cherry picked from commit 96f496a)
This was referenced Nov 19, 2025
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
2 participants
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
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)