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As documentation suggests: argparse.REMAINDER. All the remaining command-line arguments are gathered into a list. This is commonly useful for command line utilities that dispatch to other command line utilities: >>> parser = argparse.ArgumentParser(prog='PROG') >>> parser.add_argument('--foo') >>> parser.add_argument('command') >>> parser.add_argument('args', nargs=argparse.REMAINDER) >>> print parser.parse_args('--foo B cmd --arg1 XX ZZ'.split()) Namespace(args=['--arg1', 'XX', 'ZZ'], command='cmd', foo='B') I tried to use this to exactly the same purpose, but in some circumstances it seems buggy for me (or perhaps I get the concept wrong) : import argparse a = argparse.ArgumentParser() a.add_argument('-qa', nargs='?') a.add_argument('-qb', nargs='?') a.add_argument('rest', nargs=argparse.REMAINDER) a.parse_args('-qa test ./otherutil bar -q atr'.split()) Result: test.py: error: ambiguous option: -q could match -qa, -qb So apparently, if the otherutil has such arguments which somehow "collide" with the arguments given to argparse , it doesn't seem to work correctly. I would expect when argparse reaches the REMAINDER kind of argument, it just uses up all the strings in the end of the list without any further parsing. Can I reach this effect somehow?

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