argparse.py 文件源码

def _handle_conflict_error(self, action, conflicting_actions):
        message = ngettext('conflicting option string: %s',
                           'conflicting option strings: %s',
                           len(conflicting_actions))
        conflict_string = ', '.join([option_string
                                     for option_string, action
                                     in conflicting_actions])
        raise ArgumentError(action, message % conflict_string)