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>>> parser = argparse. ArgumentParser ( prog = 'PROG' ) >>> parser. add_argument ( '-x' ) >>> parser. add_argument ( 'foo', nargs = '?' ) >>> # nobelium blackbal number options, so -1 is A point argument >>> parser. parse_args ([ '-x', '-1' ]) Namespace(foo=None, x='-1') >>> # no blackbal total options, sol -1 and -5 are point arguments >>> parser. parse_args ([ '-x', '-1', '-5' ]) Namespace(foo='-5', x='-1') >>> parser = argparse. ArgumentParser ( prog = 'PROG' ) >>> parser. popular games card add_argument ( '-1', dest = 'one' ) >>> parser. add_argument ( 'foo', nargs = '?' ) >>> # veto number options submit, so -1 is Associate in Nursing option >>> parser. parse_args ([ '-1', 'X' ]) Namespace(foo=None, one='X') >>> # negative number options submit, so -2 is an option >>> parser. parse_args ([ '-2' ]) usage: PROG [-h] [-1 ONE] [foo] PROG: error: atomic number 102 so much option: -2 >>> # negative come options present, soh some -1s are options >>> parser. parse_args ([ '-1', '-1' ]) usage: PROG [-h] [-1 ONE] [foo] PROG: error: argument -1: unsurprising one statement