TypeError:列表索引必须是整数，而不是list.怎么修? [英] TypeError: list indices must be integers, not list. How to fix?

问题描述

其中包含带有TypeError的代码. 列表索引必须是整数，而不是列表"，尽管它们是整数.非常感谢您帮助我找出问题所在.我需要从源7x5选项卡中获得具有不同值的矩阵7x5.错误发生在最后一行.

There's the code with the TypeError in it. "list indices must be integers, not list", though they are integers. I'd appreciate you helping me figure out what's wrong. What I need is to get matrix 7x5 from source 7x5 tab with different values. The error occurs on the last line.

lines = []

with open("text.txt") as f:
    for line in f:
        line = [int(x) for x in line if (x != ' ') and (x != '\n')]
        lines.append(line)
    f.close()

读取文件后，我得到的是带有数字的列表列表，称为行".它是整数.不是字符串.喜欢:

What I have after reading file is list of lists with numbers called "lines". It's integers. Not strings. Like:

>> [[1, 2, 3...], [4, 5, 6...], [7, 8, 9...],[...]]


i = 1
j = 1
T = []
T.append(lines[0][0]) 

我这样做是为了避免最后一行(i-1和其他内容)中的IndexError(列表超出范围).虽然，我不认为这确实是python-way.我也非常感谢您对此事的帮助.

I made this for avoiding IndexError (list out of range) on last line (i-1 and stuff). Though, I don't think it's python-way really. I'd appreciate help with this thing too.

for i in lines:
    for j in lines:
        T[i][j] = lines[i][j] + max(T[i][j-1], T[i-1][j])

这是发生错误的地方.如果i，j已经是int，我不知道该如何解决.

This is where error occurs. I don't get what should I fix if i, j are already int.

推荐答案

i和j不是索引；它们是lines列表中的值. Python for循环是 for-each构造.

i and j are not indices; they are values from the lines list. Python for loops are for-each constructs.

使用:

for i, line in enumerate(lines):
    for j, value in enumerate(line):
        T[i][j] = value + max(T[i][j - 1 % len(T[i])] + T[i - 1 % len(T)][j])

其中，当i和/或j为0时，% len()计算将回绕"到T或T[i]中的最后一个条目. enumerate()函数将索引添加到循环中.

where the % len() calculations 'wrap around' to the last entry in T or T[i] when i and / or j are 0. The enumerate() function adds indices to the loop.

这确实假定您已经在T中预构建了列表结构的嵌套列表.

This does assume you already pre-built a nested list of lists structure in T.

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