使用Python创建向量 [英] Creating Vectors with Python

问题描述

我创建一个向量类，其中一个参数是向量的长度。如果用户没有输入，则长度自动为0。例如： v（5）会是 [0,0 ，0,0,0] 和 v（）将会是 [] 。
这是我到目前为止的代码，但它不是很工作。任何建议？

I'm creating a vector class that has one parameter being the length of a vector. The length is automatically 0 if none is entered by user. If a vector is given a length, however, each number will be set to 0. For example: v(5) would be [0,0,0,0,0] and v() would be []. This is the code i have thus far, but it's not quite working. Any advice?

class V:

    def __init__(self, length = 0):
        self.vector = [0]*length
    def __str__(self):
        print(self.vector)
    def __len__(self):
        return len(self.vector)

然后我插入 a = V 5）并且当i 打印（a）和 TypeError。任何建议？

Then i plug in a = V() b = V(5) and when i print(a) and print(b) i get an TypeError. Any advice?

推荐答案

我可能会欺骗和去分类 list ：

I'd probably cheat and go for sub-classing list:

class V(list):
    def __init__(self, length=0):
        super(V, self).__init__([0] * length)

<长度，repr和其他好东西免费。

This way you get the length, repr and other goodies for free.

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