如何在python中引用父方法？ [英] how to refer to a parent method in python?

问题描述

假设我有两个类（一个是父类，一个是子类）。如果方法也在子类中定义不同，我如何引用父类中的方法？

Suppose I have two classes (one a parent and one a subclass). How do I refer to a method in the parent class if the method is also defined in the subclass different?

这是代码：

class A:
    def __init__(self, num):
        self.value=num
    def f(self, num):
        return self.value+2
class B(A):
    def f(self, num):
        return 7*self.f(num)

在最后一行中，我想用self.f（num）来引用父类A. 命令，而不是B中的方法本身会产生无限递归。提前谢谢你。

In the very last line, I want to refer to the parent class A with the "self.f(num)" command, not the method itself in B which would create an infinite recursion. Thank you in advance.

推荐答案

如果你知道你想要使用A，你也可以用这种方式明确地引用A： / p>

If you know you want to use A you can also explicitly refer to A in this way:

class B(A):
    def f(self,num): 
        return 7 * A.f(self,num)

记住你必须明确地将self参数赋给成员函数Af（）

remember you have to explicitly give the self argument to the member function A.f()

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