save project

snake.py

@@ -61,6 +61,8 @@ while True:
     else:
         position.pop(0)
     if x>630 or x<0 or y>450 or y<0:
+        score-=2
+    if score<0:
         exit()
     # 将背景图画上去
     screen.blit(background, (0, 0))