如何入门 Python 爬虫？
发表于：2022-11-24 10:23:32浏览：20次TAG：
想要入门 Python 爬虫，需要掌握以下几个步骤：
1. 学习 Python 基础知识，包括变量、数据类型、函数、流程控制、循环、字符串操作等等。掌握好 Python 基础，才能更好地理解爬虫相关的知识。
2. 学习 HTTP 协议和 HTML/CSS/JS 相关知识。客户端和服务端通过 HTTP 协议进行通信，在爬取网页时，需要解析 HTML/CSS/JS 代码，获取所需要的信息。
3. 学习网页解析工具。Python 爬虫常用的网页解析工具有 Beautiful Soup、lxml、pyquery 等等。可以根据自己的需求选择适合的工具。
4. 学习网络请求库。Python 爬虫常用的网络请求库有 urllib、requests 等等。这些库可以帮助我们向网页发起请求，并获取响应。
5. 学习数据库。在爬虫过程中，我们需要将获取到的数据保存下来。可以学习 MySQL、MongoDB、Redis 等开源数据库，根据自己的需求选择合适的数据库。
6. 实践。学习完爬虫相关的知识后，需要进行大量的实践。可以从简单的网页爬取开始，逐步提高难度，丰富爬虫经验，掌握更多实用技巧。
总之，入门 Python 爬虫需要掌握多个知识点，并且需要进行多次实践。希望以上的介绍对你有所帮助。
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- 请求信息 : 2024-11-24 18:33:07 HTTP/1.1 GET : http://xn.iwdd.cn/home/article/detail/id/4007.html
- 运行时间 : 0.082444s [ 吞吐率：12.13req/s ] 内存消耗：2,040.59kb 文件加载：151
- 查询信息 : 30 queries
- 缓存信息 : 16 reads,0 writes
- 会话信息 : SESSION_ID=2f993f20b19e69aab29eb938b33036b6
- CONNECT:[ UseTime:0.000504s ] mysql:host=127.0.0.1;port=3306;dbname=xn_iwdd_cn;charset=utf8mb4
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- SELECT * FROM `cms_article` WHERE `id` = 4007 LIMIT 1 [ RunTime:0.000401s ]
- SHOW FULL COLUMNS FROM `cms_article_keywords` [ RunTime:0.000427s ]
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- UPDATE `cms_article` SET `read` = `read` + 1 WHERE `id` = 4007 [ RunTime:0.004430s ]
- SHOW FULL COLUMNS FROM `cms_article_cate` [ RunTime:0.000489s ]
- SELECT * FROM `cms_article_cate` ORDER BY `sort` DESC [ RunTime:0.000265s ]
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- SHOW FULL COLUMNS FROM `cms_keywords` [ RunTime:0.000495s ]
- SELECT * FROM `cms_keywords` WHERE `status` = 1 ORDER BY rand() , id desc LIMIT 20 [ RunTime:0.000362s ]
- SELECT `a`.`id`,`a`.`title`,`a`.`thumb`,`a`.`create_time`,`a`.`read`,`a`.`desc`,`f`.`filepath` FROM `cms_article` `a` LEFT JOIN `cms_file` `f` ON `a`.`thumb`=`f`.`id` WHERE `a`.`status` = '1' ORDER BY rand() , a.id desc LIMIT 10 [ RunTime:0.014613s ]
- SELECT `k`.`id`,`k`.`title` FROM `cms_article_keywords` `a` LEFT JOIN `cms_keywords` `k` ON `k`.`id`=`a`.`keywords_id` WHERE `a`.`aid` = '3317' AND `k`.`status` = '1' LIMIT 4 [ RunTime:0.000514s ]
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- SHOW FULL COLUMNS FROM `cms_user_log` [ RunTime:0.000529s ]
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