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())