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Bug description:
I was using the namespace argument in parse_args and found that argparse tries to setdefault on a mapping proxy when parsing unknown extra attributes:
importargparseparser=argparse.ArgumentParser()subparser=argparse.ArgumentParser()subparsers=parser.add_subparsers()subparsers.add_parser(name="sub",add_help=False)classMyNamespace:passtry:parser.parse_args(["sub","oops"],namespace=MyNamespace)exceptSystemExit:pass
Traceback (most recent call last):File "<path_to_script>", line 16, in <module>parser.parse_args(["sub", "oops"], namespace=MyNamespace)File "<python_installation>/lib/python3.12/argparse.py", line 1891, in parse_argsargs, argv = self.parse_known_args(args, namespace)File "<python_installation>/lib/python3.12/argparse.py", line 1924, in parse_known_argsnamespace, args = self._parse_known_args(args, namespace)File "<python_installation>/lib/python3.12/argparse.py", line 2139, in _parse_known_argsstop_index = consume_positionals(start_index)File "<python_installation>/lib/python3.12/argparse.py", line 2095, in consume_positionalstake_action(action, args)File "<python_installation>/lib/python3.12/argparse.py", line 2000, in take_actionaction(self, namespace, argument_values, option_string)File "<python_installation>/lib/python3.12/argparse.py", line 1268, in callvars(namespace).setdefault(_UNRECOGNIZED_ARGS_ATTR, [])AttributeError: 'mappingproxy' object has no attribute 'setdefault'I suspect this is because we're attempting to do vars(MyNamespace) instead of vars(argparse.Namespace) but I don't know much more than that.
I skimmed the top couple entries on the issue tracker with keywords 'argparse mappingproxy / argparse namespace' and found nothing, so I've decided that maybe nobody has reported this yet.
Using python 3.12.1 / argparse 1.1 / osx-arm64.
CPython versions tested on:
3.12
Operating systems tested on:
macOS
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