actions which are general "store" instructions.
    e.g. anything which has an argument style like:
       $ script.py -f myfilename.txt

def is_standard(action):
    """ actions which are general "store" instructions.
    e.g. anything which has an argument style like:
       $ script.py -f myfilename.txt
    """
    boolean_actions = (
        _StoreConstAction, _StoreFalseAction,
        _StoreTrueAction
    )
    return (not action.choices
            and not isinstance(action, _CountAction)
            and not isinstance(action, _HelpAction)
            and type(action) not in boolean_actions)