8-2 getattr和getattribute

from datetime import date,datetime

class User:
    def __init__(self,name,birth,info):
        self.name = name
        self.birth = birth
        self.info = info
        # self.age = 0

    def __getattr__(self, item):
        return self.info[item]


user = User("zhou",date(year=1987,month=1,day=1),info={"hight":170,"weight":57,"age":31})
print(user.age)
>>> 31

在实例中查找不到age属性时，会调用getattr魔法函数，
但是

class User:
    def __init__(self,name,birth,info):
        self.name = name
        self.birth = birth
        self.info = info
        # self.age = 0

    def __getattr__(self, item):
        return self.info[item]

    def __getattribute__(self, item):
        return "boo"


user = User("zhou",date(year=1987,month=1,day=1),info={"hight":170,"weight":57,"age":31})
print(user.birth) 
>>> boo

getattribute是在实例化之后，查找属性时执行的，不管找不找得到，只要执行属性查找，就会自动调用这个函数，所以能不重写就不要重写