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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"argparse.BooleanOptionalAction accepts and silently discards choices, metavar, and type arguments","articleBody":"This is an elaboration of issue #85039.\r\n\r\n    \u003e\u003e\u003e parser = ArgumentParser()\r\n    \u003e\u003e\u003e parser.add_argument('--foo', action=BooleanOptionalAction,\r\n    ...     choices=[1,2], metavar='FOOBAR', type=int)  # doctest: +ELLIPSIS\r\n    BooleanOptionalAction(...)\r\n\r\nNote that the store_const, store_true, and store_false actions disallow those keyword arguments.\r\n\r\n    \u003e\u003e\u003e parser.add_argument('--bar', action='store_true', choices=[1,2])\r\n    Traceback (most recent call last):\r\n      ...\r\n    TypeError: __init__() got an unexpected keyword argument 'choices'\r\n    \u003e\u003e\u003e parser.add_argument('--bar', action='store_true', metavar='FOOBAR')\r\n    Traceback (most recent call last):\r\n      ...\r\n    TypeError: __init__() got an unexpected keyword argument 'metavar'\r\n    \u003e\u003e\u003e parser.add_argument('--bar', action='store_true', type=int)\r\n    Traceback (most recent call last):\r\n      ...\r\n    TypeError: __init__() got an unexpected keyword argument 'type'\r\n    \u003e\u003e\u003e parser.add_argument('--bar', action='store_true')  # doctest: +ELLIPSIS\r\n    _StoreTrueAction(...)\r\n\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-103678\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/samwyse","@type":"Person","name":"samwyse"},"datePublished":"2022-05-03T18:25:57.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/92248/cpython/issues/92248"}