New submission from Louie Lu: When adding mutually exclusive group and required is True, and the group argument has default value. If we type its default value, argparse will ignore the input and return `argument is required`
------- PoC -------- import argparse parser = argparse.ArgumentParser() group = parser.add_mutually_exclusive_group(required=True) group.add_argument('-v', type=int, default=10) print(parser.parse_args()) ----- $ python tests.py -v 10 usage: tests.py [-h] -v V tests.py: error: one of the arguments -v is required $ python tests.py -v 11 Namespace(v=11) ---------- components: Library (Lib) messages: 292293 nosy: louielu priority: normal severity: normal status: open title: argparse mx_group is required, when action value equal default will be ignore versions: Python 3.7 _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue30163> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com