New submission from Reuben Thomas <r...@sc3d.org>:
The following code: group = parser.add_mutually_exclusive_group() group.add_argument('--install-only', action='store_true', help='just install the program, do not run it') group.add_argument('args', metavar='ARGUMENT', nargs='*', default=None, help='arguments to PROGRAM') gives the following error: group.add_argument('args', metavar='ARGUMENT', nargs='*', File "/usr/lib/python3.8/argparse.py", line 1398, in add_argument return self._add_action(action) File "/usr/lib/python3.8/argparse.py", line 1621, in _add_action raise ValueError(msg) ValueError: mutually exclusive arguments must be optional But the 'args' argument *is* optional, as there can be 0 of them. ---------- components: Library (Lib) messages: 377460 nosy: rrt priority: normal severity: normal status: open title: argparse.add_mutually_exclusive_group fails for optional positional arguments versions: Python 3.8 _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue41854> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com