code: def scroll_y(self, pixels, relative=True):
          '''
          Negative values for @pixels scroll up, positive values scroll down;
          @relative determines whether to set the scroll-y value or change as 
          above.
          '''
          if relative:
              self.offset.y += int(pixels)
          else:
              self.offset.y = int(pixels)
          self._update(f scroll_y(self, pixels, relative=True):
          '''
          Negative values for @pixels scroll up, positive values scroll down;
          @relative determines whether to set the scroll-y value or change as 
          above.
          '''
          if relative:
              self.offset.y += int(pixels)
          else:
              self.offset.y = int(pixels)
          self._update()
docs: Negative values for @pixels scroll up, positive values scroll down;
          @relative determines whether to set the scroll-y value or change as 
          above.