在简单的python for循环上列出索引超出范围错误 [英] List index out of range error on simple python for loop

问题描述

有人可以向我解释为什么此for循环不起作用.我正在尝试在另一个程序中使用类似的东西来循环使用N作为参数的列表.

Can someone explain to me why this for loop doesn't work. I'm trying to use something like this in another program to loop through a list using this N as a parameter.

    N = [20,40,60,80]

    for j in N:
        print(j)
        for i in range(0,N[j]):
            print(i)

提前谢谢！

推荐答案

您超出范围，因为j正在获取N数组元素的值，而不是索引.因此，j不是0、1、2、3，而是20、40、60、80. 因此，当您到达for i in range((0, N[j])时，您要输入N [20]，这远远超出了N列表的长度.

You're out of range, because j is taking the values of the elements of the N array, not the index. So, j is not 0, 1, 2, 3 but rather 20, 40, 60, 80. So, when you get to for i in range((0, N[j]), you're asking for N[20], which is well beyond the length of the N list.

您可以这样做:

N = [20,40,60,80]

for j in range(len(N)):
#        ^^^^^^^^^^^^^
    print(j)
    for i in range(0,N[j]):
        print(i)

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