爬取网页信息，直观明了地展示requests ,bs4，re等库的用法，囊括多种功能的实现，可供初学者参考的有用的代码样例，举一反三可以实现更多的功能。(Crawling the web information, displaying the use of requests, BS4, re and other libraries, including a variety of functions, which can be used as a useful code sample for beginners.)