lishichengyan的博客

参考：https://blog.youkuaiyun.com/itachi85/article/details/50773358 自己写了一个： # 抽象观察者 class Observer: def receiveMessage(self, message: str) -> None: raise NotImplementedError("Must subclass me...

参考：https://blog.youkuaiyun.com/zhengzhb/article/details/7610745 例子： # 抽象迭代器 class Iterator: def has_next(self) -> bool: raise NotImplementedError("Must subclass me!") def first(se...