'super' 在 Python 中有什么作用?- super().__init__() 和显式超类 __init__() 的区别 [英] What does 'super' do in Python? - difference between super().__init__() and explicit superclass __init__()

问题描述

有什么区别:

class Child(SomeBaseClass):
    def __init__(self):
        super(Child, self).__init__()

和:

class Child(SomeBaseClass):
    def __init__(self):
        SomeBaseClass.__init__(self)

我已经看到 super 在只有单一继承的类中被大量使用.我可以理解您为什么要在多重继承中使用它，但不清楚在这种情况下使用它的优势是什么.

I've seen super being used quite a lot in classes with only single inheritance. I can see why you'd use it in multiple inheritance but am unclear as to what the advantages are of using it in this kind of situation.

推荐答案

super() 在单继承中的好处是微乎其微的 -- 大多数情况下，您不必对将基类的名称添加到使用其父方法的每个方法中.

The benefits of super() in single-inheritance are minimal -- mostly, you don't have to hard-code the name of the base class into every method that uses its parent methods.

然而，如果没有super()，几乎不可能使用多重继承.这包括常见的习惯用法，如混入、接口、抽象类等.这会扩展到以后扩展您的代码的代码.如果有人后来想编写一个扩展 Child 和一个 mixin 的类，他们的代码将无法正常工作.

However, it's almost impossible to use multiple-inheritance without super(). This includes common idioms like mixins, interfaces, abstract classes, etc. This extends to code that later extends yours. If somebody later wanted to write a class that extended Child and a mixin, their code would not work properly.

这篇关于'super' 在 Python 中有什么作用?- super().__init__() 和显式超类 __init__() 的区别的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！