save project

snake.py

@@ -64,7 +64,9 @@ while True:
         Score += 1
     else :
         position.pop(0)
-    if x <
+    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