将一个类的多个函数绑定到另一个类的类事件:有没有更好/更短的方法？

def bind_functions_to_event(event_name):
    def decorator(cls):
        def bind_functions(self):
            for attr_name in dir(cls):
                attr = getattr(cls, attr_name)
                if callable(attr) and attr_name != '__init__':
                    setattr(self, event_name, attr)
        cls.bind_functions = bind_functions
        return cls
    return decorator

@bind_functions_to_event('on_event')
class EventListener:
    def on_event(self):
        print("Event occurred!")

class EventTrigger:
    def __init__(self):
        self.on_event = None

    def trigger_event(self):
        if self.on_event:
            self.on_event()

# 使用示例
listener = EventListener()
trigger = EventTrigger()
listener.bind_functions()
trigger.on_event = listener.on_event
trigger.trigger_event()  # 输出 "Event occurred!"