# handle keyboard events
  for event in pygame.event.get():
    if event.type == pygame.QUIT :
      sys.exit()
    elif event.type == KEYDOWN and event.key == K_ESCAPE:
      sys.exit()
    elif event.type == KEYDOWN and (event.key == K_DOWN or event.key == K_UP):
      rightPaddle.update( event.key )
    elif event.type == KEYDOWN and event.key == K_w:
      leftPaddle.update( K_UP )
    elif event.type == KEYDOWN and event.key == K_s:
      leftPaddle.update( K_DOWN )