How to use lxml to judge whether the website announcement is updated

   Recently, my good friend is participating in the recruitment of University , All processes are finished , But I haven't got the final news . I heard that he is going to open the bulletin board of the school's official website at any time , See if there are any new announcements . As a crawler lover, I , I have to come out and do something , I have been committed to converting tedious and boring work into automatic operation .