class为啥需要加下划线?
bs4 BeautifulSoup re html_doc soup BeautifulSoup(html_doc,) () links soup.find_all() link links(link.name, link[], link.get_text()) () link_code soup.find(,) (link_code.name, link_code[], link_code.get_text()) () link_code soup.find(,re.compile()) (link_code.name, link_code[], link_code.get_text()) () p_code soup.find(, ) (p_code.name, p_code.get_text())