48.py

def rotate(matrix: list[list[int]]) -> None:
    n = len(matrix)

    # transpose
    for i in range(n):
        for j in range(i+1, n):
            matrix[i][j], matrix[j][i] = matrix[j][i], matrix[i][j]

    print(matrix)
    # rotate
    for i in range(n):
        for j in range(n // 2):
            matrix[i][j], matrix[i][n - j - 1] = matrix[i][n - j - 1], matrix[i][j],

    print(matrix)


rotate(matrix = [[1,2,3],[4,5,6],[7,8,9]])