argparse wrongly claims '*' positional argument is required in error output

[moi90]

Bug report

Bug description:

While this issue has been fixed for the top-level parser (#72795), it still exists in sub-parsers. This test case (added to test_argparse.py) fails:

def test_subparser_required_args_zero_or_more(self):
    sub_parsers = self.parser.add_subparsers()
    sub_parser = sub_parsers.add_parser('sub')

    sub_parser.add_argument('bar')
    sub_parser.add_argument('baz', nargs='*')
    self.assertRaisesRegex(argparse.ArgumentError,
                            'the following arguments are required: bar$',
                            self.parser.parse_args, ["sub"])

CPython versions tested on:

CPython main branch

Operating systems tested on:

Linux

[brianschubert]

cc @serhiy-storchaka

[moi90]

I'm sorry, this bug report was premature. The above test only failed because of I forgot exit_on_error=False in sub_parser = sub_parsers.add_parser('sub').

I experience the "required argument" error in 3.12.3 (provided by Ubuntu), but it is fixed on the 3.12 branch.