帮我写一个螺旋矩阵的代码。

好的，下面是一个Python实现的螺旋矩阵代码：

def spiral_matrix(n):
    matrix = [[0] * n for _ in range(n)]
    count = 1
    row, col = 0, 0
    for i in range((n + 1) // 2):
        # 上边
        for j in range(col, n - col):
            matrix[row][j] = count
            count += 1
        # 右边
        for j in range(row + 1, n - row):
            matrix[j][n - col - 1] = count
            count += 1
        # 下边
        for j in range(n - col - 2, col - 1, -1):
            matrix[n - row - 1][j] = count
            count += 1
        # 左边
        for j in range(n - row - 2, row, -1):
            matrix[j][col] = count
            count += 1
        row += 1
        col += 1
    return matrix

使用方法：

n = 5
matrix = spiral_matrix(n)
for row in matrix:
    print(row)

输出结果：

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