如何通过变量更改(绑定)触发函数

class EventListener:
    def __init__(self):
        self.listeners = {}

    def add_listener(self, event, listener):
        if event not in self.listeners:
            self.listeners[event] = []
        self.listeners[event].append(listener)

    def remove_listener(self, event, listener):
        if event in self.listeners:
            self.listeners[event].remove(listener)

    def trigger_event(self, event, data):
        if event in self.listeners:
            for listener in self.listeners[event]:
                listener(data)

# 示例函数
def my_function(data):
    print("触发函数被调用，参数为：" + str(data))

# 创建事件监听器对象
event_listener = EventListener()

# 绑定函数到事件
event_listener.add_listener("variable_changed", my_function)

# 模拟变量更改
variable = 10
variable = 20

# 触发事件
event_listener.trigger_event("variable_changed", variable)