auto save

snake.py

@@ -18,6 +18,7 @@ while True:
         if event.type == locals.QUIT:
             # 接收到退出事件后退出程序
             exit()
+    x+=30
     # 将背景图画上去
     screen.blit(background, (0, 0))
     # 将贪吃蛇画上去