属性访问_魔法方法
# !/usr/bin/python3# -*- coding: utf-8 -*-
# @Time : 2023/2/19 21:35
# @Author : xiongming
# @File : shuxingxiangguanhanshu.py
# @Desc : 属性访问
class C:
def __init__(self, name, age):
self.name = name
self.__age = age
c = C("小甲鱼", 18)
# 查询类的属性是否有name
a = hasattr(c, "name")
print(a)
# 获取对象某个属性值
b = getattr(c, "name")
# name mangling _类名__私有属性名
e = getattr(c, "_C__age")
print(b)
print(e)
# setattr 修改私有属性
setattr(c, "_C__age", 19)
print(getattr(c, "_C__age"))
# delattr 删除私有属性
delattr(c, "_C__age")
print(hasattr(c, "_C__age"))
# 魔法方法
class A:
def __init__(self, name, age):
self.name = name
self.__age = age
def __getattribute__(self, attrname):
print("拦截'小甲鱼'，拿来吧你")
return super().__getattribute__(attrname)
a = A("小甲鱼", 18)
aa = getattr(a, "_A__age")
print(aa)
a._A__age
class B:
def __init__(self, name, age):
self.name = name
self.__age = age
def __getattribute__(self, attrname):
print("拦截'小甲鱼'，拿来吧你")
return super().__getattribute__(attrname)
def __getattr__(self, item):
if item == "FishC":
print("I love FishC")
else:
raise AttributeError(item)
print("------BBBB--------")
bb = B("小甲鱼", 18)
bb.FishC
print("------BBBB--------")
# bb.xxAttributeError: xx
# setattr
class DD():
def __setattr__(self, name, value):
self.__dict__ = value
def __delattr__(self, name):
del self.__dict__
dd = DD()
dd.name = "小甲鱼"
print(dd.name)
print(dd.__dict__)
del dd.name
print(dd.__dict__)
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