save project

snake.py

@@ -19,6 +19,8 @@ while True:
         if event.type == locals.QUIT:
             # 接收到退出事件后退出程序
             exit()
+if event.type == locals.KEYDOWN:
+
     # 将背景图画上去
     screen.blit(background, (0, 0))
     # 将贪吃蛇画上去