Python矩阵在sudoku的每3个数字后打印双行

def print_sudoku(matrix):
    for i in range(9):
        if i % 3 == 0 and i != 0:
            print("---------------------")
        for j in range(9):
            if j % 3 == 0 and j != 0:
                print("| ", end="")
            print(matrix[i][j], end=" ")
            if j == 8:
                print()

# 示例矩阵
sudoku_matrix = [
    [5, 3, 0, 0, 7, 0, 0, 0, 0],
    [6, 0, 0, 1, 9, 5, 0, 0, 0],
    [0, 9, 8, 0, 0, 0, 0, 6, 0],
    [8, 0, 0, 0, 6, 0, 0, 0, 3],
    [4, 0, 0, 8, 0, 3, 0, 0, 1],
    [7, 0, 0, 0, 2, 0, 0, 0, 6],
    [0, 6, 0, 0, 0, 0, 2, 8, 0],
    [0, 0, 0, 4, 1, 9, 0, 0, 5],
    [0, 0, 0, 0, 8, 0, 0, 7, 9]
]

print_sudoku(sudoku_matrix)