code: def swipe_by_percent(self, start_x, start_y, end_x, end_y, duration=1000):
          
          width = self.get_window_width()
          height = self.get_window_height()
          x_start = float(start_x) / 100 * width
          x_end = float(end_x) / 100 * width
          y_start = float(start_y) / 100 * height
          y_end = float(end_y) / 100 * height
          x_offset = x_end - x_start
          y_offset = y_end - y_start
          platform = self._get_platform()
          if platform == 'android':
              self.swipe(x_start, y_start, x_end, y_end, duration)
          else:
              self.swipe(x_start, y_start, x_offset, y_offset, duration)
docs: Swipe from one percent of the screen to another percent, for an optional duration.
          Normal swipe fails to scale for different screen resolutions, this can be avoided using percent.
  
          Args:
           - start_x - x-percent at which to start
           - start_y - y-percent at which to start
           - end_x - x-percent distance from start_x at which to stop
           - end_y - y-percent distance from start_y at which to stop
           - duration - (optional) time to take the swipe, in ms.
  
          Usage:
          | Swipe By Percent | 90 | 50 | 10 | 50 | # Swipes screen from right to left. |
  
          _*NOTE: *_
          This also considers swipe acts different between iOS and Android.
  
          New in AppiumLibrary 1.4.5