2018-04-17-super()调用父类顺序详解

最新推荐文章于 2020-10-31 12:20:02 发布

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最新推荐文章于 2020-10-31 12:20:02 发布

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分类专栏： python进阶

本文链接：https://blog.youkuaiyun.com/github_38970218/article/details/88771394

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本文通过实例详细解析了Python中单继承和多继承的概念及使用方式。展示了如何在不同层级的类中实现方法覆盖，并通过super()函数调用父类的方法。具体演示了从单一基类到多个基类继承时方法解析顺序(MRO)的行为。

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单继承

>>> class A(object):
...     def say_a(self):
...             print('A is a')
>>> class B(A):
...     def say_a(self):
...             print('B is b')
... 
>>> class C(B):
...     def say_a(self):
...             print('C is c')

>>> class D(C):
...     def say(self):
...             print("D is d")
...             super(D,self).say_a()
...             super(C,self).say_a()
...             super(B,self).say_a()
... 
>>> D().say()
D is d
C is c
B is b
A is a

多继承

>>> class  A(object):
...     def  say(self):
...             print("A is a")
... 
>>> class B(A):
...     def  say(self):
...             print("B is b")
...             super(B,self).say()
... 
>>> class C(A):
...     def say(self):
...             print("C is c")
...             super(C,self).say()
... 
>>> class D(B,C):
...     def say(self):
...             print("D is d")
...             super(D,self).say()
... 
>>> d = D() 
>>> d.say()
D is d
B is b
C is c
A is a
>>>