python魔法函数之__getattr__与__getattribute__
getattr
在访问对象的属性不存在时,调用__getattr__,如果没有定义该魔法函数会报错
class Test:
def __init__(self, name, age):
self.name = name
self.age = age
def __getattr__(self, item):
print(item) // noattr
return 'aa'
test = Test('rain', 25)
print(test.age) // 25
print(test.noattr) //aa
getattribute
访问对象任何属性(即使属性不存在)都会调用__getattribute__
#!/usr/bin/env python
# -*- encoding: utf-8 -*-
'''
@File : 04__getattr__与__getattribute__.py
@Time : 2018/12/18 21:06:50
@Author : Rain
@License : (C)Copyright 2017-2018, Liugroup-NLPR-CASIA
@Desc : None
'''
# here put code
class Test:
def __init__(self, name, age):
self.name = name
self.age = age
def __getattr__(self, item):
print(item)
return 'aa'
def __getattribute__(self, item): # 尽量不要使用它
print('访问属性了')
return 'bbb'
test = Test('rain', 25)
print(test.age)
print(test.noattr)
结果:
一点、一点才能到达彼岸