auto save

snake.py

@@ -62,8 +62,7 @@ while True:
     else:    
         position.pop(0)
     #贪吃蛇是否碰到墙
-    if x<0 or x>630 or y<0 or y>450:
-        exit()
+    
     # 将背景图画上去
     screen.blit(background, (0, 0))
     # 将贪吃蛇的头画上去