code: def lf (self):
          '''This moves the cursor down with scrolling.
          '''
  
          old_r = self.cur_r
          self.cursor_down()
          if old_r == self.cur_r:
              self.scroll_up ()
              self.erase_line(f lf (self):
          '''This moves the cursor down with scrolling.
          '''
  
          old_r = self.cur_r
          self.cursor_down()
          if old_r == self.cur_r:
              self.scroll_up ()
              self.erase_line()
docs: This moves the cursor down with scrolling.