Greg <minsh...@acm.org> added the comment:
while waiting for a fix, would it be possible to document in the argparse documentation that the 'dest' parameter is required (at least temporarily) for add_subparsers()? (somewhere near file:///usr/share/doc/python/html/library/argparse.html#sub-commands) gratuitous diff: the pull request from 2017 would probably fix it. my diffs are here (from: Python 3.8.0 (default, Oct 23 2019, 18:51:26). (the pull request changes the utility '_get_action_name'; i wasn't sure of side-effects with other callers, so changed nearer the failure location.) ---- *** new/argparse.py 2019-12-05 11:16:37.618985247 +0530 --- old/argparse.py 2019-10-24 00:21:26.000000000 +0530 *************** *** 2017,2030 **** for action in self._actions: if action not in seen_actions: if action.required: ! ra = _get_action_name(action) ! if ra is None: ! if not action.choices == {}: ! choice_strs = [str(choice) for choice in action.choices] ! ra = '{%s}' % ','.join(choice_strs) ! else: ! ra = '<unknown>' ! required_actions.append(ra) else: # Convert action default now instead of doing it before # parsing arguments to avoid calling convert functions --- 2017,2023 ---- for action in self._actions: if action not in seen_actions: if action.required: ! required_actions.append(_get_action_name(action)) else: # Convert action default now instead of doing it before # parsing arguments to avoid calling convert functions ---------- nosy: +Minshall _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue29298> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com