Python实战快速上手BeautifulSoup库爬取专栏标题和地址_Python

Python实战快速上手BeautifulSoup库爬取专栏标题和地址

2022-02-13 14:06小旺不正经 Python

BeautifulSoup是爬虫必学的技能，BeautifulSoup最主要的功能是从网页抓取数据，Beautiful Soup自动将输入文档转换为Unicode编码，输出文档转换为utf-8编码

安装

pip install beautifulsoup4
# 上面的安装失败使用下面的 使用镜像
pip install beautifulsoup4 -i https://pypi.tuna.tsinghua.edu.cn/simple

使用PyCharm的命令行

Python实战快速上手BeautifulSoup库爬取专栏标题和地址

解析标签

from bs4 import BeautifulSoup
import requests
url="https://blog.csdn.net/weixin_42403632/category_11076268.html"
headers={"User-Agent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:93.0) Gecko/20100101 Firefox/93.0"}
html=requests.get(url,headers=headers).text
s=BeautifulSoup(html,"html.parser")
title =s.select("h2")
for i in title:
    print(i.text)

第一行代码：导入BeautifulSoup库

第二行代码：导入requests

第三、四、五行代码：获取url的html

第六行代码：激活BeautifulSoup库 "html.parser"设置解析器为HTML解析器

第七行代码：选取所有<h2>标签

Python实战快速上手BeautifulSoup库爬取专栏标题和地址

解析属性

BeautifulSoup库支持根据特定属性解析网页元素

根据class值解析

from bs4 import BeautifulSoup
import requests
url="https://blog.csdn.net/weixin_42403632/category_11076268.html"
headers={"User-Agent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:93.0) Gecko/20100101 Firefox/93.0"}
html=requests.get(url,headers=headers).text
s=BeautifulSoup(html,"html.parser")
title =s.select(".column_article_title")
for i in title:
    print(i.text)

Python实战快速上手BeautifulSoup库爬取专栏标题和地址

根据ID解析

from bs4 import BeautifulSoup
html="""<div class="crop-img-before">
         <img src=""      </div>
        <div id="title">
        测试成功
        </div>
      <div class="crop-zoom">
         <a href="javascript:;" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  class="bt-reduce">-</a><a href="javascript:;" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  class="bt-add">+</a>
      </div>
      <div class="crop-img-after">
         <div  class="final-img"></div>
      </div>"""
s=BeautifulSoup(html,"html.parser")
title =s.select("#title")
for i in title:
    print(i.text)

Python实战快速上手BeautifulSoup库爬取专栏标题和地址

多层筛选

from bs4 import BeautifulSoup
html="""<div class="crop-img-before">
         <img src=""      </div>
        <div id="title">
        456456465
        <h1>测试成功</h1>
        </div>
      <div class="crop-zoom">
         <a href="javascript:;" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  class="bt-reduce">-</a><a href="javascript:;" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  class="bt-add">+</a>
      </div>
      <div class="crop-img-after">
         <div  class="final-img"></div>
      </div>"""
s=BeautifulSoup(html,"html.parser")
title =s.select("#title")
for i in title:
    print(i.text)
title =s.select("#title h1")
for i in title:
    print(i.text)

提取a标签中的网址

title =s.select("a")
for i in title:
    print(i["href"])

Python实战快速上手BeautifulSoup库爬取专栏标题和地址

实战-获取博客专栏标题+网址

Python实战快速上手BeautifulSoup库爬取专栏标题和地址

from bs4 import BeautifulSoup
import requests
import re
url="https://blog.csdn.net/weixin_42403632/category_11298953.html"
headers={"User-Agent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:93.0) Gecko/20100101 Firefox/93.0"}
html=requests.get(url,headers=headers).text
s=BeautifulSoup(html,"html.parser")
title =s.select(".column_article_list li a")
for i in title:
    print((re.findall("原创.*?
(.*?)
",i.text))[0].lstrip())
    print(i["href"])

Python实战快速上手BeautifulSoup库爬取专栏标题和地址