why is there a position exchange?

Why is there an exchange of "(x, y) = (y, x) if x > y"? If there wasn't such an exchange, does it affect the calculation result if x > y ? Thank you for your time!

Day01-15/code/Day04/for5.py

@@ -8,8 +8,6 @@ Date: 2018-03-01
 
 x = int(input('x = '))
 y = int(input('y = '))
-if x > y:
-    (x, y) = (y, x)
 for factor in range(x, 0, -1):
     if x % factor == 0 and y % factor == 0:
         print('%d和%d的最大公约数是%d' % (x, y, factor))