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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"argparse assertion failure with brackets in metavars","articleBody":"BPO | [11874](https://bugs.python.org/issue11874)\n--- | :---\nNosy | @ncoghlan, @merwok, @IIIIllllIIIIllllIIIIllllIIIIllllIIIIll, @wimglenn, @vajrasky, @wm75, @spaceone, @miss-islington\nPRs | \u003cli\u003epython/cpython#1826\u003c/li\u003e\u003cli\u003epython/cpython#7527\u003c/li\u003e\u003cli\u003epython/cpython#7528\u003c/li\u003e\u003cli\u003epython/cpython#7530\u003c/li\u003e\u003cli\u003epython/cpython#7553\u003c/li\u003e\nFiles | \u003cli\u003e[issue_11874.diff](https://bugs.python.org/file21832/issue_11874.diff \"Uploaded as text/plain at 2011-04-29.09:06:42 by ysj.ray\")\u003c/li\u003e\u003cli\u003e[unit_test_for_inner_bracket_metavar.txt](https://bugs.python.org/file30911/unit_test_for_inner_bracket_metavar.txt \"Uploaded as text/plain at 2013-07-14.03:44:13 by @vajrasky\"): Unit test\u003c/li\u003e\u003cli\u003e[unit_test_argparse.txt](https://bugs.python.org/file30913/unit_test_argparse.txt \"Uploaded as text/plain at 2013-07-14.09:42:30 by @vajrasky\"): Revamped unit test\u003c/li\u003e\u003cli\u003e[fix_and_unit_test_for_argparse_inner_bracket_bug.txt](https://bugs.python.org/file30915/fix_and_unit_test_for_argparse_inner_bracket_bug.txt \"Uploaded as text/plain at 2013-07-14.10:58:14 by @vajrasky\"): Fix and unit test for the argparse inner bracket metavar bug\u003c/li\u003e\u003cli\u003e[format_usage.patch](https://bugs.python.org/file35028/format_usage.patch \"Uploaded as text/plain at 2014-04-24.22:12:11 by paul.j3\")\u003c/li\u003e\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 = 'https://github.com/ncoghlan'\nclosed_at = \u003cDate 2018-06-09.10:53:29.284\u003e\ncreated_at = \u003cDate 2011-04-19.08:20:50.571\u003e\nlabels = ['3.7', 'type-bug', 'library']\ntitle = 'argparse assertion failure with brackets in metavars'\nupdated_at = \u003cDate 2018-06-09.10:53:29.283\u003e\nuser = 'https://bugs.python.org/htnieman'\n```\n\nbugs.python.org fields:\n```python\nactivity = \u003cDate 2018-06-09.10:53:29.283\u003e\nactor = 'ncoghlan'\nassignee = 'ncoghlan'\nclosed = True\nclosed_date = \u003cDate 2018-06-09.10:53:29.284\u003e\ncloser = 'ncoghlan'\ncomponents = ['Library (Lib)']\ncreation = \u003cDate 2011-04-19.08:20:50.571\u003e\ncreator = 'htnieman'\ndependencies = []\nfiles = ['21832', '30911', '30913', '30915', '35028']\nhgrepos = []\nissue_num = 11874\nkeywords = ['patch']\nmessage_count = 23.0\nmessages = ['134021', '134558', '134741', '149547', '193021', '193022', '193042', '193046', '193068', '193072', '193112', '193187', '216812', '230187', '230198', '262105', '294575', '295214', '319041', '319050', '319054', '319124', '319127']\nnosy_count = 15.0\nnosy_names = ['ncoghlan', 'bethard', 'eric.araujo', 'ysj.ray', 'xuanji', 'htnieman', 'manveru', 'paul.j3', 'wim.glenn', 'vajrasky', 'wolma', 'mZarjk', 'spaceone', 'mattpr', 'miss-islington']\npr_nums = ['1826', '7527', '7528', '7530', '7553']\npriority = 'high'\nresolution = 'fixed'\nstage = 'resolved'\nstatus = 'closed'\nsuperseder = None\ntype = 'behavior'\nurl = 'https://bugs.python.org/issue11874'\nversions = ['Python 2.7', 'Python 3.4', 'Python 3.5', 'Python 3.6', 'Python 3.7']\n```\n\n\u003c/p\u003e\u003c/details\u003e\n","author":{"url":"https://github.com/htnieman","@type":"Person","name":"htnieman"},"datePublished":"2011-04-19T08:20:51.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":23},"url":"https://github.com/56083/cpython/issues/56083"}