Python 实现带取消注册功能的发布 - 订阅模式：EventEmitter 与 Listener 类详解

以下是使用 Python 实现的简单发布-订阅模式： ```python class Listener: def __init__(self, name): self.name = name def handle(self, event_data): print(f"{self.name} 收到事件: {event_data}") class EventEmitter: def __init__(self): self.listeners = {} def on(self, event_name, listener): if event_name not in self.listeners: self.listeners[event_name] = [] self.listeners[event_name].append(listener) def emit(self, event_name, event_data): if event_name in self.listeners: for listener in self.listeners[event_name]: listener.handle(event_data) def off(self, event_name, listener): if event_name in self.listeners: self.listeners[event_name] = [l for l in self.listeners[event_name] if l!= listener] ``` 使用示例： ```python emitter = EventEmitter() listener1 = Listener("Listener 1") listener2 = Listener("Listener 2") emitter.on("event1", listener1) emitter.on("event1", listener2) emitter.emit("event1", "Some data") emitter.off("event1", listener1) emitter.emit("event1", "More data") ``` ######[AI写代码神器 | 316点数解答 | 2024-11-09 00:54:20]