optparse Option._check_callback raises TypeError instead of OptionError for tuple callback_kwargs

[stefanzetzsche]

Bug report

Bug description:

Issue

When callback_kwargs is a tuple, Option._check_callback raises TypeError instead of OptionError. The error message is formatted with %r % self.callback_kwargs. When callback_kwargs is a tuple, Python's % operator unpacks it as multiple format arguments, causing TypeError: not all arguments converted during string formatting.

Reproducer

from optparse import Option
Option('--foo', action='callback', callback=lambda *a: None, callback_kwargs=(1, 2))
# TypeError: not all arguments converted during string formatting
# Expected: OptionError

CPython versions tested on:

CPython main branch

Operating systems tested on:

No response

Linked PRs

• gh-145821: properly raise OptionError in Option._check_callback when callback_kwargs is invalid #145822