BeautifulSoup是一个可以从HTML或XML文件中提取数据的Python库.它能够通过你喜欢的转换器实现惯用的文档导航,查找,修改文档的方式.Beautiful Soup会帮你节省数小时甚至数天的工作时间
from bs4 import BeautifulSoup
```python
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>
"""
#创建soup对象
soup = BeautifulSoup(html_doc,'html.parser')
#获取所有的连接
links = soup.find_all('a')
for link in links:
print(link.name,link['href'],link.get_text())
a http://example.com/elsie Elsie
a http://example.com/lacie Lacie
a http://example.com/tillie Tillie
#获取指定URL
link_node = soup.find('a',href = 'http://example.com/lacie')
print (link_node.name,link_node['href'],link_node.get_text())
print()
a http://example.com/lacie Lacie
import re
#正则匹配
link_node = soup.find('a',href = re.compile(r"ill"))
print (link_node.name,link_node['href'],link_node.get_text())
a http://example.com/tillie Tillie
#指定段落文字指定的class
p_node = soup.find('p',class_= 'title')
print(p_node.name,p_node.get_text())
p The Dormouse's story
