python子类 [英] python subclasses

问题描述

我目前有一个名为Polynomial的类，初始化如下所示：

I currently have a class called Polynomial, The initialization looks like this:

def __init__(self, *termpairs):
    self.termdict = dict(termpairs) 

我正在创建一个多项式键入指数和
相关值是系数。要创建此类的实例，请输入如下：

I'm creating a polynomial by making the keys the exponents and the associated values are the coefficients. To create an instance of this class, you enter as follows:

d1 = Polynomial((5,1), (3,-4), (2,10))

这使得字典如此：

{2: 10, 3: -4, 5: 1}

现在，我想创建一个名为Quadratic的Polynomial类的子类。我想在Quadratic类构造函数中调用Polynomial类构造函数，但是我不太清楚如何做到这一点。我试过的是：

Now, I want to create a subclass of the Polynomial class called Quadratic. I want to call the Polynomial class constructor in the Quadratic class constructor, however im not quite sure how to do that. What I have tried is:

class Quadratic(Polynomial):
def __init__(self, quadratic, linear, constant):
    Polynomial.__init__(self, quadratic[2], linear[1], constant[0])

但我收到错误，有人有任何提示吗？当我调用Polynomial类构造函数时，我觉得我使用了不正确的参数。

but I get errors, anyone have any tips? I feel like I'm using incorrect parameters when I call the Polynomial class constructor.

推荐答案

你可能想要

class Quadratic(Polynomial):
    def __init__(self, quadratic, linear, constant):
        Polynomial.__init__(self, (2, quadratic), (1, linear), (0, constant))

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