auto save

snake.py

@@ -65,6 +65,7 @@ while True:
         position.pop(0)
     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
@@ -72,7 +73,9 @@ while True:
     # 将贪吃蛇的身体画上去
     for i in range(len(position)-1):
         screen.blit(body, position[i])
-
+    for i in range(len(position)-2):
+        if (x,y)==position[i]:
+            exit()
     # 将果实画上去
     screen.blit(food, (apple_x, apple_y))
     info="Score"+str(score)