code: def _get_down_up_string(self):
          
          down_up = ""
          if not (self.down and self.up):
              if self.down:
                  down_up = "down"
              elif self.up:
                  down_up = "up"
          return down_up
docs: Return a string that will show whether the string is up or down
  
          return 'down' if the key is a press only
          return 'up' if the key is up only
          return '' if the key is up & down (as default)