Add comment to function

Author: gsp

days/13-15-text-games/rock_scissors_paper/rps.py

@@ -9,6 +9,9 @@ def __init__(self, roll_name=''):
             self.roll_name = roll_name.lower()
 
     def win(self):
+        """
+        :return: string of the roll defeated by a given key. i.e rock defeats scissors, so we return scissors for key = rock
+        """
         d = dict(rock='scissors', scissors='paper', paper='rock')
         return d[self.roll_name]