save project

snake.py

@@ -64,10 +64,13 @@ while True:
         apple_y = 30*num2-30
         apple_y = 30*num2-30
         score +=10
         score +=10
 
 
-else:
-    position.pop(0)
+    else:
+        position.pop(0)
 
 
+ if x < 0 or x > 630 or y < 0 or y > 450:
+     exit()
     position.pop(0)
     position.pop(0)
+
     # 将背景图画上去
     # 将背景图画上去
     screen.blit(background, (0, 0))
     screen.blit(background, (0, 0))
     # 将贪吃蛇的头画上去
     # 将贪吃蛇的头画上去