python - 如何将 "broadcast"消息发送给一个类的所有对象？

Question

class Person:
    def __init__(self, name):
        self.name = name
        self.bucket = []
    def announce(self, *args):
        # ???
        pass
    def put(self, item):
        self.bucket.append(item)


p1 = Person("ya")
p2 = Person("yu")

p1.put("apple")

现在我想以某种方式向所有 Person() 对象宣布我的桶中有一个苹果，如果他们愿意，他们也应该将一个苹果放入桶中。

Answer 1

简单的实现可以是:

class Person:
    persons = set()

    def __init__(self, name):
        self.name = name
        self.bucket = []
        self.persons.add(self)

    def announce(self, msg):
        print("[{}]: {}".format(self.name,msg))

    @classmethod
    def broadcast(cls, person, msg):
        for p in cls.persons:
            if not p is person:
                p.announce(msg)

    def put(self, item):
        self.bucket.append(item)
        self.broadcast(self, '{}: got {} in my bucket!'.format(self.name, item))

p1 = Person("ya")
p2 = Person("yu")

p1.put("apple")
Person.broadcast(None, "Hey! Everybody can broadcast message!")

输出:

[yu]: "ya: got apple in my bucket!
[ya]: Hey! Everybody can broadcast message!
[yu]: Hey! Everybody can broadcast message!

该实现缺乏

• 没有注销实现
• 无线程保存
• 可以通知Person及其子类
• 这只是一个玩具，您需要根据实际情况对其进行调整

也许你最好实现一个 Observer pattern比那个简单的要好。