python三种属性管理魔法函数

class Foo(object):

    def __init__(self):

        pass

    def __setattr__(self, key, value):

        print("调用setattr方法,属性为：", key, value)

        super().__setattr__(key, value)

    def __getattr__(self, item):

        print("调用getattr方法,属性为：", item)

        return None

obj = Foo()

obj.x = 123

print(obj.x)

print(obj.w)