Python 有几种网页解析器？
1、 正则表达式
2、html.parser (Python自动)
3、BeautifulSoup（第三方）（功能比较强大） 是一个HTML/XML的解析器
4、lxml （第三方）
BeautifulSoup 栗子：
地址：https://www.crummy.com/software/BeautifulSoup/bs4/download/
PyCharm安装方法
file → Settings → Project Interpreter(这一步需要你自己找一下)，点击右边 "+" 加号，输入 beautifulsoup 选择对应的版本就ok了，上图：
来一个栗子：
from bs4 import BeautifulSoupimport rehtml_doc = """The Dormouse's story The Dormouse's story
Once upon a time there were three little sisters; and their names wereElsie,Lacie andTillie;and they lived at the bottom of a well.
...
"""soup = BeautifulSoup(html_doc,'html.parser',from_encoding='utf-8')print('获取所有的连接')links = soup.find_all('a')for link in links: print(link.name,link['href'],link.get_text())print('获取lacie的连接')link_node = soup.find('a',href='http://example.com/lacie')print(link.name, link['href'], link.get_text())#模糊匹配print('正则匹配')link_node = soup.find('a',href=re.compile(r'lll'))print(link.name, link['href'], link.get_text())print('获取P段落文字')param = input('请输入要检索的样式名称：')p_node = soup.find('p',class_='story')print(p_node.name, p_node.get_text())