Update maximum_combination.py

Author: mohammadreza490

maths/maximum_combination.py

@@ -1,10 +1,11 @@
+#!/usr/bin/python
+# -*- coding: utf-8 -*-
+
 """
 Source: https://www.instagram.com/p/CG7kv65A6s1/?utm_source=ig_web_copy_link
-
 The following function accepts 2 positive integers 
 and makes the first number as large as possible 
 by swapping out its digits for digits in second number
-
 >>> maximum_combination(9132,5564)
 9655
 >>> maximum_combination(523,76)
@@ -26,17 +27,17 @@ def maximum_combination(first_num, second_num):
     second_num = [int(x) for x in str(second_num)]
     first_num = [int(x) for x in str(first_num)]
     second_num.sort(reverse=True)
-    for index, val in enumerate(first_num):
+    for (index, val) in enumerate(first_num):
         if len(second_num) > 0:
             if second_num[0] > val:
                 first_num[index] = second_num[0]
                 second_num.pop(0)
         else:
             break
-    return int("".join(map(str, first_num)))
+    return int(''.join(map(str, first_num)))
 
 
-if __name__ == "__main__":
+if __name__ == '__main__':
     from doctest import testmod
 
     testmod()