auto save

snake.py

 import pygame
 from pygame import locals
-
+import random
 # 初始化pygame，为使用硬件做准备
 pygame.init()
 x,y=240,120
@@ -19,6 +19,7 @@ while True:
     x+=30
     ada.append((x,y))
     ada.pop(0)
+    
     for event in pygame.event.get():
         if event.type == locals.QUIT:
             # 接收到退出事件后退出程序
@@ -31,11 +32,9 @@ while True:
     for i in range(len(ada)-1):
         screen.blit(body,ada[i])
     screen.blit(food, (360, 300))
-    if x<0 or x>630 or y<0 or y>450:
-        exit()
+    if x<0
     
 
-    # 将果实画上去
-    # 刷新画面
+
     pygame.display.update()
     FPSLOCK.tick(3)