為什么在遍歷列表矩陣時出現列表索引超出范圍錯誤？

Question

我正在嘗試遍歷矩陣列表，即（向右移動 3 個值，向下移動 1 個值）並看到上述錯誤。 預期值正在打印到控制台，這表明該值存在並且沒有超出范圍。

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，這個問題也會持續存在。 我的輸入數據在這里：

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Answer 1

Python 列表（和矩陣）是零索引的。

您太早地將 1 添加到該行，因此在最后一行中，您嘗試訪問最后一行之后不存在的行。 嘗試將row = row + 1放在col = col + 1之前。 然后從那里繼續調試。

或者，您可以從row = -1開始，它應該可以工作，但它有點“臟”。

此外，由於您已經在使用枚舉，您可能需要考慮

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

因為 enumerate 已經為您提供了所需的索引。