Question

Write a function called diagonal_sum that takes a 2D list(matrix) of 3x3as a parameter and prints its Left diagonal sum and Right diagonal sum

Answer 1

def diagonals(A):
    right = A[0][0] + A[1][1] + A[2][2]
    left = A[0][2] + A[2][2] + A[2][0]
    print(f'Right diagonal: {right}')
    print(f'Left diagonal: {left}')

def main():
    A = [[1, 2, 3],
         [1, 1, 1],
         [3, 2, 1]]
    diagonals(A)

main()