以更有效的方式访问3D矩阵的所有奇数索引，然后全部为偶数

matrix = [[[1, 2, 3], [4, 5, 6], [7, 8, 9]],
          [[10, 11, 12], [13, 14, 15], [16, 17, 18]],
          [[19, 20, 21], [22, 23, 24], [25, 26, 27]]]

for i in range(len(matrix)):
    for j in range(len(matrix[i])):
        for k in range(len(matrix[i][j])):
            if i % 2 != 0 and j % 2 != 0 and k % 2 != 0:
                matrix[i][j][k] += 1

for i in range(len(matrix)):
    for j in range(len(matrix[i])):
        for k in range(len(matrix[i][j])):
            print(matrix[i][j][k], end=" ")
        print()
    print()