Python3 getattr, getattrubute 区别和应用场景

最新推荐文章于 2025-09-03 16:58:00 发布

原创最新推荐文章于 2025-09-03 16:58:00 发布 · 209 阅读

CC 4.0 BY-SA版权

Python

# -*- coding: utf-8 -*- """ @Time: 2018/4/30 @Author: songhao @微信公众号: zeropython @File: demo_getattr.py """ """ getattr, getattrubute getattr 在查找不到属性的时候调用 class User: def __init__(self,name): self.name =name def __getattr__(self, item): return ("not find atter") if __name__ == '__main__': user= User("songhao") print(user.age) print(user.name) 输出结果 # not find atter # songhao class User: def __init__(self, name, info={}): self.name = name self.info = info def __getattr__(self, item): return self.info[item] if __name__ == '__main__': user = User("songhao",info={"weixin":"zeropython"}) print(user.weixin) 输出： # zeropython class User: def __init__(self, name, info={}): self.name = name self.info = info def __getattr__(self, item): return self.info[item] def __getattribute__(self, item): # 调用属性最优先调用这个属性 return "hello world" if __name__ == '__main__': user = User("songhao",info={"weixin":"zeropython"}) print(user.weixin) 输出： #hello world

# -*- coding: utf-8 -*-

"""

@Time: 2018/4/30

@Author: songhao

@微信公众号: zeropython

@File: demo_getattr.py

"""

"" "

getattr, getattrubute

getattr 在查找不到属性的时候调用

class User:

def __init__(self,name):

self.name =name

def __getattr__(self, item):

return (" not find atter ")

if __name__ == '__main__':

user= User(" songhao ")

print(user.age)

print(user.name)

输出结果

# not find atter

# songhao

class User:

def __init__(self, name, info={}):

self.name = name

self.info = info

def __getattr__(self, item):

return self.info[item]

if __name__ == '__main__':

user = User(" songhao ",info={" weixin ":" zeropython "})

print(user.weixin)

输出：

# zeropython

class User:

def __init__(self, name, info={}):

self.name = name

self.info = info

def __getattr__(self, item):

return self.info[item]

def __getattribute__(self, item):

# 调用属性最优先调用这个属性

return " hello world "

if __name__ == '__main__':

user = User(" songhao ",info={" weixin ":" zeropython" } )

print ( user . weixin )

输出：

#hello world

Python

#!/usr/bin/env python3 # -*- coding: utf-8 -*- class Student(object): def __init__(self): self.name = 'Michael' def __getattr__(self, attr): if attr=='score': return 99 if attr=='age': return lambda: 25 raise AttributeError('\'Student\' object has no attribute \'%s\'' % attr) s = Student() print(s.name) print(s.score) print(s.age()) # AttributeError: 'Student' object has no attribute 'grade' print(s.grade)