【LeetCode with Python】 Rotate Image

class Solution:
    # @param matrix, a list of lists of integers
    # @return a list of lists of integers
    def rotate(self, matrix):
        n = len(matrix)
        if 1 == n:
            return matrix
        round = int(n / 2)
        for x in range(0, round):
            for y in range(x, n - x - 1):
                tmp = matrix[n - y - 1][x]
                matrix[n - y - 1][x] = matrix[n - x - 1][n - y - 1]
                matrix[n - x - 1][n - y - 1] = matrix[y][n - x - 1]
                matrix[y][n - x - 1] = matrix[x][y]
                matrix[x][y] = tmp
        return matrix