save project

snake.py

@@ -22,7 +22,7 @@ while True:
             # 接收到退出事件后退出程序
             exit()
     x += 30     
-    position.append(x,y)
+    position.append((x,y))
     position.pop(0)
     # 将背景图画上去
     screen.blit(background, (0, 0))