爬虫与反爬虫实现全流程

我选取的网页爬取的是ppt nba版

需要的工具:pycharm,浏览器

爬虫需要观察它的网页信息,然后开始首先爬取它的html,可以看到有人气,标题,日期,咨询

可以看到用get方法

import requests
url="https://img-home.csdnimg.cn/images/20230724024159.png?origin_url=https%3A%2F%2Fwww.ptt.cc%2Fbbs%2FNBA%2Findex.html&pos_id=lJ5YB9Tu"
respone=requests.get(url)
print(respone.text)

接下来把它下载下来

with open('output.html','w',encoding='utf-8')as f:
    f.write(respone.text)

反爬虫使用header方法,观察User-Agent: AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

放入header

import requests
url="https://img-home.csdnimg.cn/images/20230724024159.png?origin_url=https%3A%2F%2Fwww.ptt.cc%2Fbbs%2FNBA%2Findex.html&pos_id=lJ5YB9Tu"
headers={'User-Agent:Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36'}
respone=requests.get(headers=headers)
# print(respone.text)
with open('output.html','w',encoding='utf-8')as f:
    f.write(respone.text)

接下来正式开始爬取自己想要的资料

 去终端机安一下beautifulsoup

pip install beautifulsoup4

 解析获得文章列表parser

soup beautifulSoup(respone.text,"html.parser" )

接下来把我们需要的值一个一个取出来

标题: div  a  title.text

人气:div class=nrec span

日期:div date