auto save

snake.py

 import pygame
 from pygame import locals
-xy = [(0,90),(30,90),(60,90),(90,90)]
+xy = []
 FPS = pygame.time.Clock()
-x = 90
-y = 90
 
 # 初始化pygame，为使用硬件做准备
 pygame.init()
@@ -23,10 +21,6 @@ while True:
         if event.type == locals.QUIT:
             # 接收到退出事件后退出程序
             exit()
-    x += 30
-    for i in range(4):
-        xy.del(i)
-        xy.insert(i,(x-4*30+i*30,y))
     # 将背景图画上去
     screen.blit(background, (0, 0))
     # 将贪吃蛇画上去