#A bouncing ball

 import sys, pygame

 __author__ = {'name' : 'Hongten',

               'mail' : 'hongtenzone@foxmail.com',

               'blog' : 'http://www.cnblogs.com/hongten',

               'QQ'   : '',

               'Version' : '1.0'}

 pygame.init()

 size = width, height = 600, 500

 speed = [1, 1]

 black = 249, 130, 57

 screen = pygame.display.set_mode(size)

 ball = pygame.image.load('c:\\test\\ball.gif')

 ballrect = ball.get_rect()

 while 1:

     for event in pygame.event.get():

         if event.type == pygame.QUIT:

             sys.exit()

     ballrect = ballrect.move(speed)

     if ballrect.left < 0 or ballrect.right > width:

         speed[0] = -speed[0]

     if ballrect.top < 0 or ballrect.bottom > height:

         speed[1] = - speed[1]

     screen.fill(black)

     screen.blit(ball, ballrect)

     pygame.display.flip()