code: def get_user_stats_for_game(self, steamID, appID, format=None):
          
          parameters = {'steamid' : steamID, 'appid' : appID}
          if format is not None:
              parameters['format'] = format
          url = self.create_request_url(self.interface, 'GetUserStatsForGame', 2,
              parameters)
          data = self.retrieve_request(url)
          return self.return_data(data, format=format)
docs: Request the user stats for a given game.
  
          steamID: The users ID
          appID: The app id
          format: Return format. None defaults to json. (json, xml, vdf)