New submission from Siming Yuan <simin...@gmail.com>:
If you take the example from https://docs.python.org/3/library/argparse.html#argparse.ArgumentParser.add_subparsers # create the top-level parser parser = argparse.ArgumentParser(prog='PROG') parser.add_argument('--foo', action='store_true', help='foo help') subparsers = parser.add_subparsers(help='sub-command help') # create the parser for the "a" command parser_a = subparsers.add_parser('a', help='a help') parser_a.add_argument('-bar', type=int, help='bar help') # create the parser for the "b" command parser_b = subparsers.add_parser('b', help='b help') parser_b.add_argument('--baz', choices='XYZ', help='baz help') and run a subcommand but with an argument the subcommand doesn't understand parser.parse_args(['a', '-x']) the output doesn't help much - because the usage is coming from the main parser usage: PROG [-h] [--foo] {a,b} ... PROG: error: unrecognized arguments: -x the reason for failure is because the error api being called in this case is parser.error(msg) not the subparser parser_a.error(msg) the proper error should've been usage: PROG a [-h] [-bar BAR] PROG a: error: unrecognized arguments: -x ---------- components: Library (Lib) messages: 323956 nosy: siming85 priority: normal severity: normal status: open title: ArgumentParser subparser error display at the wrong level type: behavior versions: Python 3.4, Python 3.5, Python 3.6 _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue34479> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
