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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"argparse.ArgumentParser.add_mutually_exclusive_group : metavar create parenthesis undefined behavior","articleBody":"BPO | [45580](https://bugs.python.org/issue45580)\n--- | :---\nNosy | @lysnikolaou, @pablogsal, @sobolevn, @AbcSxyZ\n\n\u003csup\u003e*Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.*\u003c/sup\u003e\n\n\u003cdetails\u003e\u003csummary\u003eShow more details\u003c/summary\u003e\u003cp\u003e\n\nGitHub fields:\n```python\nassignee = None\nclosed_at = None\ncreated_at = \u003cDate 2021-10-22.19:31:30.976\u003e\nlabels = ['type-bug', 'library', '3.9', '3.10', '3.11']\ntitle = 'argparse.ArgumentParser.add_mutually_exclusive_group : metavar create parenthesis undefined behavior'\nupdated_at = \u003cDate 2021-10-25.16:32:34.545\u003e\nuser = 'https://github.com/AbcSxyZ'\n```\n\nbugs.python.org fields:\n```python\nactivity = \u003cDate 2021-10-25.16:32:34.545\u003e\nactor = 'paul.j3'\nassignee = 'none'\nclosed = False\nclosed_date = None\ncloser = None\ncomponents = ['Library (Lib)']\ncreation = \u003cDate 2021-10-22.19:31:30.976\u003e\ncreator = 'AbcSxyZ'\ndependencies = []\nfiles = []\nhgrepos = []\nissue_num = 45580\nkeywords = []\nmessage_count = 4.0\nmessages = ['404815', '404891', '404893', '404981']\nnosy_count = 5.0\nnosy_names = ['paul.j3', 'lys.nikolaou', 'pablogsal', 'sobolevn', 'AbcSxyZ']\npr_nums = []\npriority = 'normal'\nresolution = None\nstage = None\nstatus = 'open'\nsuperseder = None\ntype = 'behavior'\nurl = 'https://bugs.python.org/issue45580'\nversions = ['Python 3.9', 'Python 3.10', 'Python 3.11']\n```\n\n\u003c/p\u003e\u003c/details\u003e\n","author":{"url":"https://github.com/AbcSxyZ","@type":"Person","name":"AbcSxyZ"},"datePublished":"2021-10-22T19:31:31.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":5},"url":"https://github.com/89743/cpython/issues/89743"}