如何通过类对象停止一个函数与另一个函数一起运行

import threading

class MyClass:
    def __init__(self):
        self.flag = True
        self.lock = threading.Lock()

    def functionA(self):
        while self.flag:
            # 执行函数A的代码
            pass

    def functionB(self):
        while self.flag:
            # 执行函数B的代码
            pass

    def stopFunctions(self):
        with self.lock:
            self.flag = False

# 创建类对象
myObj = MyClass()

# 创建线程并启动
threadA = threading.Thread(target=myObj.functionA)
threadB = threading.Thread(target=myObj.functionB)
threadA.start()
threadB.start()

# 停止函数A和函数B的同时运行
myObj.stopFunctions()

# 等待线程结束
threadA.join()
threadB.join()