python爬虫之BeautifulSoup的HTML解析

　　BeautifulSoup是一个用于从HTML和XML文件中提取数据的python库，它提供一些简单的函数来处理导航、搜索、修改分析树等功能。BeautifulSoup能自动将文档转换成Unicode编码，输出文档转换为UTF-8编码。

　　本例直接创建模拟HTML代码，进行美化：

# 导入BeautifulSoup库
from bs4 import BeautifulSoup

# 创建模拟HTML代码的字符串
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>
"""
# 创建一个BeautifulSoup对象，获取页面正文
soup = BeautifulSoup(html_doc, features="lxml")
# 打印解析的HTML代码
print('经BeautifulSoup美化的代码：',soup)
print('===================================')
print('通过prettify()方法进行代码的格式化处理：',soup.prettify())

结果：

经BeautifulSoup美化的代码： <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 class="sister" href="http://example.com/elsie" id="link1">Elsie</a>,
<a class="sister" href="http://example.com/lacie" id="link2">Lacie</a> and
<a class="sister" href="http://example.com/tillie" id="link3">Tillie</a>;
and they lived at the bottom of a well.</p>
<p class="story">...</p>
</body></html>
===================================
通过prettify()方法进行代码的格式化处理： <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 class="sister" href="http://example.com/elsie" id="link1">
    Elsie
   </a>
   ,
   <a class="sister" href="http://example.com/lacie" id="link2">
    Lacie
   </a>
   and
   <a class="sister" href="http://example.com/tillie" id="link3">
    Tillie
   </a>
   ;
and they lived at the bottom of a well.
  </p>
  <p class="story">
   ...
  </p>
 </body>
</html>

 

posted @ 2020-05-21 22:00  夏日的向日葵  阅读(1153)  评论(0)  编辑  收藏  举报