save project

snake.py

@@ -21,8 +21,8 @@ while True:
             # 接收到退出事件后退出程序
             exit()
     x+=30
-    position.append()
-    position.pop()
+    position.append((x,y))
+    position.pop(0)
     # 将背景图画上去
     screen.blit(background, (0, 0))
     # 将贪吃蛇画上去