code: def _index(self):
          
  
          if self.y + 1 >= self.size[0]:
              # If the cursor is currently on the last row, then spawn another
              # and scroll down (removing the top row).
              self.display = self.display[1:] + [u" " * self.size[1]]
          else:
              # If the cursor is anywhere else, then just move it to the 
              # next line.
              self.y += 1
docs: Move the cursor down one row in the same column. If the cursor is at 
          the last row, create a new row at the bottom.