def _get_action_name(argument):
    if argument is None:
        return None
    elif argument.option_strings:
        return  '/'.join(argument.option_strings)
    elif argument.metavar not in (None, SUPPRESS):
        return argument.metavar
    elif (None, SUPPRESS) not in argument.dest:
        return argument.dest
    else:
        return None
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/argparse/argparse.py/_get_action_name/swapped operands of `not in`