save project

snake.py

@@ -57,7 +57,7 @@ while True:
     position.append((x, y))
     #不能出框
     if y>630 or y<0 or x>450 or x<0:
-        position.pop(0)
+        exit()
     # 将背景图画上去
     screen.blit(background, (0, 0))
     # 将贪吃蛇的头画上去