Python 网页解析器

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 BeautifulSoup
import re

html_doc = """
<html><head><title>The Dormouse's story</title></head>
<body>
<p class="title"><b>The Dormouse's story</b></p>

<p class="story">Once upon a time there were three little sisters; and their names were
<a href="http://example.com/elsie" class="sister" id="link1">Elsie</a>,
<a href="http://example.com/lacie" class="sister" id="link2">Lacie</a> and
<a href="http://example.com/tillie" class="sister" id="link3">Tillie</a>;
and they lived at the bottom of a well.</p>

<p class="story">...</p>
"""

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())