python类操作符重载

class ():
    def __setattr__(self, n, v):
        if n == 'age':
            self.__dict__[n] = v
        print 'setattr'

    def __getattr__(self, n):
        if n == 'age':
            return self.__dict__[n]

obj = Object()
obj.age = 2
print obj.age

setattr
2