Update and rename matrix-sum-diagonals.py to matrix_sum_diagonals.py

arrays_and_strings/matrix_sum_diagonals.py

@@ -0,0 +1,20 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+# author: bt3gl
+
+def diagonal_difference(arr):
+
+    diag_1 = 0
+    diag_2 = 0
+    
+    i, j = 0, len(arr) - 1
+    
+    while i < len(arr) and j >= 0:
+        
+        diag_1 += arr[i][i]
+        diag_2 += arr[i][j]
+        i += 1
+        j -= 1
+        
+    return diag_1, diag_2, abs(diag_1 - diag_2)
+