Python3 solution to https://www.hackerrank.com/challenges/diagonal-difference/problem

findDiagonalDifference.py

# Python3 solution to https://www.hackerrank.com/challenges/diagonal-difference/problem

# test data
first_array = [11, 2, 4]
second_array = [4, 5, 6]
third_array = [10, 8, -12]
sumArray = []
sumArray.append(first_array)
sumArray.append(second_array)
sumArray.append(third_array)


def findDiagonalDifference(array):
    primaryDiagonal = []
    secondaryDiagonal = []
    index = 0
    last_index = len(array[0]) - 1
    for arrayRow in array:
        primaryDiagonal.append(arrayRow[index])
        secondaryDiagonal.append(arrayRow[last_index])
        last_index -= 1
        index += 1


    sum_primary = sum(primaryDiagonal)
    sum_secondary = sum(secondaryDiagonal)

    abs_difference = abs(sum_primary - sum_secondary)

findDiagonalDifference(sumArray)