gh-153967: handle invalid file object in argparse._print_message

[ptim0626]

The fix for the above issue, which raises a ValueError if an invalid file is explicitly passed to argparse.print_usage and argparse.print_help. Tests added.

• Issue: argparse _print_message silently fails with invalid file object #153967

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[python-cla-bot]

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[ZeroIntensity]

This is also a user-facing change; please add a news entry.

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Most changes to Python require a NEWS entry. Add one using the blurb_it web app or the blurb command-line tool.

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[bedevere-app]

Most changes to Python require a NEWS entry. Add one using the blurb_it web app or the blurb command-line tool.

If this change has little impact on Python users, wait for a maintainer to apply the skip news label instead.

[ptim0626]

This is also a user-facing change; please add a news entry.

Thanks, and this was added.

[ptim0626]

Now I have no idea why test_ctypes failed in the CI...

[ZeroIntensity]

That would be #154106. I just updated the branch, which should fix it.

[ptim0626]

The merge fixed the test_ctypes but the sanitizer build failed with test_external_inspection.

[chris-eibl]

No worries. test_external_inspection is a known flaky test. Also the readthedocs hiccuped - I hit "update branch" to trigger CI again and hope for the best :)