Python3 Program to Rotate all Matrix elements except the diagonal K times by 90 degrees in clockwise direction

# Python3 program for the above approach

# Function to print the matrix
def printMat(mat):
  
    # Iterate over the rows
    for i in range(len(mat)):

        # Iterate over the columns
        for j in range(len(mat[0])):

            # Print the value
            print(mat[i][j], end = " ")
            
        print()

# Function to perform the swapping of
# matrix elements in clockwise manner
def performSwap(mat, i, j):
  
    N = len(mat)

    # Stores the last row
    ei = N - 1 - i

    # Stores the last column
    ej = N - 1 - j

    # Perform the swaps
    temp = mat[i][j]
    mat[i][j] = mat[ej][i]
    mat[ej][i] = mat[ei][ej]
    mat[ei][ej] = mat[j][ei]
    mat[j][ei] = temp

# Function to rotate non - diagonal
# elements of the matrix K times in
# clockwise direction
def rotate(mat, N, K):

    # Update K to K % 4
    K = K % 4

    # Iterate until K is positive
    while (K > 0):

        # Iterate each up to N/2-th row
        for i in range(int(N / 2)):

            # Iterate each column
            # from i to N - i - 1
            for j in range(i, N - i - 1):

                # Check if the element
                # at i, j is not a
                # diagonal element
                if (i != j and (i + j) != N - 1):

                    # Perform the swapping
                    performSwap(mat, i, j)
                    
        K -= 1
                    
    # Print the matrix
    printMat(mat)

# Driver Code
K = 5
mat = [ [ 1, 2, 3, 4 ],
        [ 6, 7, 8, 9 ],
        [ 11, 12, 13, 14 ],
        [ 16, 17, 18, 19 ] ]
N = len(mat)

rotate(mat, N, K)

# This code is contributed by Dharanendra L V.