rotate_image 

 1# @leet start
 2class Solution:
 3    def rotate(self, matrix: list[list[int]]) -> None:
 4        """
 5        This function rotates a matrix 90 degrees.
 6        To do so, it grabs the four outermost cells and then rotates them like this:
 7        ![Rotate](https://assets.leetcode.com/static_assets/media/original_images/48/48_angles.png)
 8        """
 9        n = len(matrix[0])
10        for i in range(n // 2 + n % 2):
11            for j in range(n % 2):
12                tmp = matrix[n - 1 - j][i]
13                matrix[n - 1 - j][i] = matrix[n - 1 - i][n - j - 1]
14                matrix[n - 1 - i][n - i - 1] = matrix[j][n - 1 - i]
15                matrix[j][n - 1 - i] = matrix[i][j]
16                matrix[i][j] = tmp
17
18
19# @leet end
20
21
22def test():
23    assert 2 + 2 == 4
class Solution: 
 3class Solution:
 4    def rotate(self, matrix: list[list[int]]) -> None:
 5        """
 6        This function rotates a matrix 90 degrees.
 7        To do so, it grabs the four outermost cells and then rotates them like this:
 8        ![Rotate](https://assets.leetcode.com/static_assets/media/original_images/48/48_angles.png)
 9        """
10        n = len(matrix[0])
11        for i in range(n // 2 + n % 2):
12            for j in range(n % 2):
13                tmp = matrix[n - 1 - j][i]
14                matrix[n - 1 - j][i] = matrix[n - 1 - i][n - j - 1]
15                matrix[n - 1 - i][n - i - 1] = matrix[j][n - 1 - i]
16                matrix[j][n - 1 - i] = matrix[i][j]
17                matrix[i][j] = tmp
def rotate(self, matrix: list[list[int]]) -> None: 
 4    def rotate(self, matrix: list[list[int]]) -> None:
 5        """
 6        This function rotates a matrix 90 degrees.
 7        To do so, it grabs the four outermost cells and then rotates them like this:
 8        ![Rotate](https://assets.leetcode.com/static_assets/media/original_images/48/48_angles.png)
 9        """
10        n = len(matrix[0])
11        for i in range(n // 2 + n % 2):
12            for j in range(n % 2):
13                tmp = matrix[n - 1 - j][i]
14                matrix[n - 1 - j][i] = matrix[n - 1 - i][n - j - 1]
15                matrix[n - 1 - i][n - i - 1] = matrix[j][n - 1 - i]
16                matrix[j][n - 1 - i] = matrix[i][j]
17                matrix[i][j] = tmp

This function rotates a matrix 90 degrees. To do so, it grabs the four outermost cells and then rotates them like this: Rotate

def test(): 
23def test():
24    assert 2 + 2 == 4