__getattr__和__setattr__

• getattr

class Local:

    def __getattr__(self, item):
        print(item)

obj = Local()
obj.xx

运行结果

xx

• setattr

class Local():

    def __setattr__(self, key, value):
        print(key, value)

obj = Local()
obj.xx = 123

运行结果

xx 123