Python内部类调用外部类的变量，并结合with语法使用

class Outter:
    """
    外部类
    """
    def __init__(self):
        self.allow_thread_running = True

    class with_change_ip:
        """
        内部类，使用with语法
        """
        def __init__(self, father):
            """
            内部类初始化函数，构造时自动调用
            :param father: 外部类的实例对象
            """
            self.father = father

        def __enter__(self):
            """
            with语法执行前调用
            :return:
            """
            self.father.allow_thread_running = False

        def __exit__(self, type, value, trace):
            """
            with语法执行完后调用
            :return:
            """
            self.father.allow_thread_running = True

    def start(self):
        print(self.allow_thread_running)      # True
        # 传入当前实例对象作为参数
        with self.with_change_ip(self):
            print(self.allow_thread_running)  # False
        print(self.allow_thread_running)      # True
  
Outter().start()