How to define and assign values to a two-dimensional array in Python?

In Python, you can define a two-dimensional array using nested lists and assign values to it. Here is an example:

# 定义一个3x3的二维数组
array_2d = [[0, 0, 0],
            [0, 0, 0],
            [0, 0, 0]]

# 对二维数组进行赋值
array_2d[0][0] = 1
array_2d[1][1] = 2
array_2d[2][2] = 3

# 打印二维数组
for row in array_2d:
    print(row)

Output result:

[1, 0, 0]
[0, 2, 0]
[0, 0, 3]

In the example above, we defined a 3×3 two-dimensional array, array_2d, and initialized it to all zeros. We then assigned values to each element of the two-dimensional array using array_2d[i][j]. Finally, we printed the contents of the two-dimensional array row by row using nested loops.