auto save

snake.py

 import pygame
+import random
 from pygame import locals
 
 # 初始化pygame，为使用硬件做准备
@@ -51,6 +52,10 @@ while True:
         y -= 30
     else:
         y += 30
+    pos.pop
+    if food_x==x and food_y==y:
+        food_x=30*randon.randing(0,21)
+        food_y=30*randon.randing(0,15)
     position.append((x, y))
     position.pop(0)
     # 将背景图画上去
@@ -66,3 +71,4 @@ while True:
     # 刷新画面
     pygame.display.update()
     FPSCLOCK.tick(3)
+    
\ No newline at end of file