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原来 Python 爬虫这么简单!原理 + 环境 + 案例 + 代码全解析

  • 2026-03-27 05:44:51
原来 Python 爬虫这么简单!原理 + 环境 + 案例 + 代码全解析

今天一早,按领导要求后台直接强制推送了卸载游戏、非工作软件的策略,电话瞬间被打爆,这结果其实早就料到了,大家嘴上都不说不满,全是变着花样来 IT 部门找茬,阴阳怪气的话一套接一套。领导又拍板要求把外网开了白名单,这下我们直接腹背受敌,里外不是人。更绝的是,领导自己躲得不见人影,把底下干活的小兄弟推出去当挡箭牌,挨骂背锅全是我们,真的太难了……

前几天C部门还来找我们,让开发自动取数工具,理由是她们不想每月 1 号来公司拿报表。虽然开发起来也没什么难度,python+selenium+beautifulsoup4基本就可以搞定,即使要做数据分析,加上pandas就可以,但是“一朝被蛇咬,十年怕井绳”,之前好心帮她们写过一个自动填报表的 VBA,结果后来上报日期没按她们要求的特定日期出报表,直接把锅甩给 IT,一口咬定是我们程序的问题。我们的代码明明是按她们当初给的规则写的,到头来出了问题,全是 IT 的错,做好了是应该,做错了全背锅,这班真是上得一肚子气。我们直接给拒了,不是不帮,而是前车之鉴还记忆犹新呢。

这里就来简单讲讲python爬虫吧~

一、Python 爬虫是什么?

1.网络爬虫就是模拟浏览器发送网络请求,抓取网页上的公开数据(文字、图片、链接等)的自动化程序。

2.简单说:代替人工复制粘贴,自动从网页上拿数据。

3.爬虫常用库(新手必学 3 个)

  • requests:发送网络请求,获取网页源代码(最核心)

  • beautifulsoup4:解析网页,提取想要的数据

  • lxml:配合解析网页的加速库

4.爬虫技术虽然简单,但是要“从入门到入狱”也是很简单的,请大家一定要合理、合规、合法使用哈,千万不要用于采集敏感数据,也不要越权和绕过反爬取获取数据!!!

二、快速环境准备

确保电脑已安装python(最新3.14,推荐3.12或3.13,win7最高支持到3.8),打开电脑终端 / 命令提示符,执行3个基本库(requests、beautifulsoup4、lxml)的安装命令:

  • pip install requests beautifulsoup4 lxml

三、最简单爬虫案例:抓取网页标题

1.目标:抓取腾讯网的标题文字

2.完整代码(直接复制粘贴在编译器中运行)

# 1. 导入需要的库import requestsfrom bs4 import BeautifulSoup# 2. 目标网页地址url = "https://news.qq.com/"# 3. 发送请求,获取网页源代码response = requests.get(url)# 4. 解析网页soup = BeautifulSoup(response.text, "lxml")# 5. 提取数据(抓取标题)title = soup.title.string# 6. 打印结果print("抓取到的标题:", title)

运行结果

抓取到的标题: 腾讯网进程已结束,退出代码为 0

四、进阶案例:抓取豆瓣电影 TOP250 电影名

import requestsfrom bs4 import BeautifulSoup# 目标网址(豆瓣电影TOP250第一页)url = "https://movie.douban.com/top250?start=0"# 请求头(模拟浏览器,防止被拦截)headers = {    "User-Agent""Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36"}# 发送请求response = requests.get(url, headers=headers)# 解析页面soup = BeautifulSoup(response.text, "lxml")# 抓取所有电影名称movie_list = soup.find_all("div", class_="hd")# 遍历输出print("豆瓣TOP250电影(前25部):")for index, movie in enumerate(movie_list, 1):    name = movie.a.span.text.strip()    print(f"{index}{name}")

运行效果输出:

豆瓣TOP250电影(前25部):1. 肖申克的救赎2. 霸王别姬3. 泰坦尼克号4. 阿甘正传5. 千与千寻6. 美丽人生7. 星际穿越8. 这个杀手不太冷9. 盗梦空间10. 楚门的世界11. 辛德勒的名单12. 忠犬八公的故事13. 海上钢琴师14. 疯狂动物城15. 三傻大闹宝莱坞16. 机器人总动员17. 放牛班的春天18. 无间道19. 控方证人20. 寻梦环游记21. 大话西游之大圣娶亲22. 熔炉23. 触不可及24. 教父25. 末代皇帝进程已结束,退出代码为 0

五、爬虫必须遵守的规则

1.只爬公开数据,不爬登录后才能看的隐私数据

2.遵守网站 robots.txt 协议(网站允许爬哪些内容)

3.不要高频请求,容易被封 IP

4.不用于商业用途,不侵犯版权

六、总结

1.爬虫 = 发请求 + 解析网页 + 提取数据

2.新手核心库:requests + BeautifulSoup4

3.两个案例从 0 基础可直接运行,快速入门爬虫逻辑

4.合法合规是爬虫的第一原则!!!

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  1. CONNECT:[ UseTime:0.000364s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000555s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000232s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.009282s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000650s ]
  6. SELECT * FROM `set` [ RunTime:0.002318s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000646s ]
  8. SELECT * FROM `article` WHERE `id` = 482305 LIMIT 1 [ RunTime:0.000515s ]
  9. UPDATE `article` SET `lasttime` = 1774582105 WHERE `id` = 482305 [ RunTime:0.007156s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000860s ]
  11. SELECT * FROM `article` WHERE `id` < 482305 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000551s ]
  12. SELECT * FROM `article` WHERE `id` > 482305 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.016815s ]
  13. SELECT * FROM `article` WHERE `id` < 482305 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.005026s ]
  14. SELECT * FROM `article` WHERE `id` < 482305 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.062063s ]
  15. SELECT * FROM `article` WHERE `id` < 482305 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.065367s ]
0.258151s