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python - 为什么在遍历列表矩阵时出现列表索引超出范围错误？

问题描述

我正在尝试遍历矩阵列表，即（向右移动 3 个值，向下移动 1 个值）并看到上述错误。预期值正在打印到控制台，这表明该值存在并且没有超出范围。

grid = []

with open(filename) as f:
    for line in f.readlines():
        line.strip()
        grid.append(line)
print(grid)

col = 2
row = 0
count = 0

for i in enumerate(grid):
    row = row + 1
    print(grid[row][col])
    if grid[row][col] == "#":
        print("found")
        print(grid[row][col])
        count = count+1
    col = col + 3

如果我不增加 row 和 col 值，这个问题也会持续存在。我的输入数据在这里：

.........###......#...#.......#
.#.#...........#..#..#.........
#.......#.................#....
.........#.#.........#......###
.....#......##...##............
...##...#......#.....#.....##..
#.#..#....#...#....#......#....
........##.....#.....#.#.......
......#.....#......#...##.#....
...####...#.......##.....#.#...
.........#....#......##........
..##...........###.#...........
.....#............#............
#.#..#..##........#.....#..#...
.....................#....##..#
...........##.....###...#.#.#..
..#......#...........#.........
.##.##...#...#......##.#.......
......#..#......#.#.#..#.#.....
........#.#..#..........#...#.#
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...........#...##.#............
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.#..........###..#....#........
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标签： pythonalgorithmmatrix

解决方案

Python 列表（和矩阵）是零索引的。

您太早地将 1 添加到该行，因此在最后一行中，您尝试访问最后一行之后不存在的行。尝试将row = row + 1放在col = col + 1. 然后从那里继续调试。

或者，您可以从 开始row = -1，它应该可以工作，但它有点“脏”。

此外，由于您已经在使用枚举，您可能需要考虑

for idx, i in enumerate(grid):
    grid[idx][col] == '#'

因为 enumerate 已经为您提供了所需的索引。

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