My version of flipping matrix https://www.hackerrank.com/challenges/flipping-the-matrix/forum

flipping_matrix.py

def _iter_swap(m,i,j):
    for [x, y] in [(i,j), (len(m)-i-1, j), (i, len(m)-j-1), (len(m)-i-1, len(m)-j-1)]:
        yield m[x][y]
    

def _get_max(m, i, j):
    return max(_iter_swap(m, i, j))
 
    
def _iter_corner(m):
    for i in range(len(m) >> 1):
        for j in range(len(m) >> 1):
            yield i, j 
    return       
      
def flippingMatrix(matrix):
    return sum([_get_max(matrix, i, j) for [i,j] in _iter_corner(matrix)])