New submission from Mikhail Khvoinitsky <bugs.python....@khvoinitsky.org>:
Example which works: parser.add_argument('--test', nargs='+', metavar=('TEST', 'TEST2')) Example which doesn't work: parser.add_argument('test', nargs='+', metavar=('TEST', 'TEST2')) it raises: Traceback (most recent call last): File <omitted> args = parser.parse_args() File "/usr/lib/python3.8/argparse.py", line 1768, in parse_args args, argv = self.parse_known_args(args, namespace) File "/usr/lib/python3.8/argparse.py", line 1800, in parse_known_args namespace, args = self._parse_known_args(args, namespace) File "/usr/lib/python3.8/argparse.py", line 2006, in _parse_known_args start_index = consume_optional(start_index) File "/usr/lib/python3.8/argparse.py", line 1946, in consume_optional take_action(action, args, option_string) File "/usr/lib/python3.8/argparse.py", line 1874, in take_action action(self, namespace, argument_values, option_string) File "/usr/lib/python3.8/argparse.py", line 1044, in __call__ parser.print_help() File "/usr/lib/python3.8/argparse.py", line 2494, in print_help self._print_message(self.format_help(), file) File "/usr/lib/python3.8/argparse.py", line 2471, in format_help formatter.add_arguments(action_group._group_actions) File "/usr/lib/python3.8/argparse.py", line 276, in add_arguments self.add_argument(action) File "/usr/lib/python3.8/argparse.py", line 261, in add_argument invocations = [get_invocation(action)] File "/usr/lib/python3.8/argparse.py", line 549, in _format_action_invocation metavar, = self._metavar_formatter(action, default)(1) ValueError: too many values to unpack (expected 1) Expected result: help message should look like this: usage: test_argparse [-h] TEST [TEST2 ...] positional arguments: TEST optional arguments: -h, --help show this help message and exit ---------- components: Library (Lib) messages: 382341 nosy: m_khvoinitsky priority: normal severity: normal status: open title: argparse: add_argument(... nargs='+', metavar=<tuple>) does not work with positional arguments type: crash versions: Python 3.10 _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue42547> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com