面对对象的上下文管理

问题：请在Context类中添加代码完成该类的实现

class Context:
    pass

with Context as ctx:
    ctx.do_something()

答：

class Context:

    def do_something(self):
        pass

    def __enter__(self):
        return self

    # def __exit__(self, exc_type, exc_val, exc_tb):
    def __exit__(self, *argsm,**kwargs):
        pass

with Context() as ctx:
    ctx.do_something()