Python實戰(zhàn)快速上手BeautifulSoup庫爬取專欄標題和地址
發(fā)布日期：2021-12-22 09:10 | 文章來源：站長之家
BeautifulSoup庫快速上手
安裝
pip install beautifulsoup4 # 上面的安裝失敗使用下面的 使用鏡像 pip install beautifulsoup4 -i https://pypi.tuna.tsinghua.edu.cn/simple
使用PyCharm的命令行
解析標簽
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)
第一行代碼：導入BeautifulSoup庫
第二行代碼：導入requests
第三、四、五行代碼：獲取url的html
第六行代碼：激活BeautifulSoup庫 'html.parser'設置解析器為HTML解析器
第七行代碼：選取所有<h2>標簽
解析屬性
BeautifulSoup庫 支持根據(jù)特定屬性解析網(wǎng)頁元素
根據(jù)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)
根據(jù)ID解析
from bs4 import BeautifulSoup
html='''<div class="crop-img-before">
<img src="" alt="" id="cropImg">
</div>
<div id='title'>
測試成功
</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)
多層篩選
from bs4 import BeautifulSoup
html='''<div class="crop-img-before">
<img src="" alt="" id="cropImg">
</div>
<div id='title'>
456456465
<h1>測試成功</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標簽中的網(wǎng)址
title =s.select('a')
for i in title:
print(i['href'])
實戰(zhàn)-獲取博客專欄 標題+網(wǎng)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('原創(chuàng).*?\n(.*?)\n',i.text))[0].lstrip())
print(i['href'])
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