code: def scroll(self, direction='vertical', percent=0.6, duration=2.0):
          
  
          if direction not in ('vertical', 'horizontal'):
              raise ValueError('Argument `direction` should be one of "vertical" or "horizontal". Got {}'
                               .format(repr(direction)))
  
          start = [0.5, 0.5]
          half_distance = percent / 2
          if direction == 'vertical':
              start[1] += half_distance
              direction = [0, -percent]
          else:
              start[0] += half_distance
              direction = [-percent, 0]
  
          return self.swipe(start, direction=direction, duration=duration)
docs: Scroll from the lower part to the upper part of the entire screen.
  
          Args:
              direction (:py:obj:`str`): scrolling direction. "vertical" or "horizontal"
              percent (:py:obj:`float`): scrolling distance percentage of the entire screen height or width according to
               direction
              duration (:py:obj:`float`): time interval in which the action is performed