观察者模式

import time


class Observer:
    def __init__(self, name) -> None:
        self.name = name

    def update(self, message):
        print("name %s received message: %s" % (self.name, message))


class Subject:
    def __init__(self) -> None:
        self.objects = []

    def add_object(self, observer: Observer):
        self.objects.append(observer)

    def notify(self, name, message):
        for o in self.objects:
            if o.name == name:
                o.update(message)


actions = ["烟花", "二踢脚", "鱼雷王", "曼城春雨"]
subject = Subject()
for action in actions:
    observer = Observer(action)
    subject.add_object(observer)


for action in actions:
    subject.notify(action, "开始点燃了")
    time.sleep(1)