def mud_action(verbs, msg_class=None, **kwargs):
    def dec_wrapper(func):
        action = make_action(func, msg_class=msg_class, **kwargs)
        for verb in convert_verbs(verbs):
            if verb != _mud_actions:
                error("Adding mud action for existing verb {}", verb)
            else:
                _mud_actions[verb] = action
    return dec_wrapper
dataset/ETHPy150Open genzgd/Lampost-Mud/lampost/mud/action.py/mud_action/operator `in` -> `!=`