这里写目录标题

本节课内容所需要安装的库：
BeautifulSoup 简介：
lxml 简介：
requests ，BeautifulSoup 和 lxml 相互三者关系：
如何利用 bs4 的 BeautifulSoup 抓取和筛选需要的数据：
bs4 的 Beautiful Soup 详细解释：
HTML 基础：
- 什么是 html :
- 网页的组成:
list 学习：
for 循环基础学习：
- for 的使用方法：
变量名：
- 为什么find_all 要用 for 才能打印出来呢?
回顾一下整体代码
课程总结：

本节课内容所需要安装的库：

第一个：bs4 库
第二个：lxml 库

不会安装包库的请参考《第4课：在 Pycharm 编译器里，如何安装库模块包》

BeautifulSoup 简介：

Beautiful Soup 是一个可以从HTML或XML文件中提取数据的Python库.它能够通过你喜欢的转换器实现惯用的文档导航,查找,修改文档的方式.Beautiful Soup会帮你节省数小时甚至数天的工作时间.

点击进入 bs4：官方中文文档

lxml 简介：

lxml是功能最丰富，最易于使用的库，用于以Python语言处理，解析，格式化 XML和HTML。

requests ，BeautifulSoup 和 lxml 相互三者关系：

在我们用用 requests 得到网站响应的请求，并且能获取请求的网页信息后，我们就需要 BeautifulSoup 来查找锁定你需要的信息。我们用 requests 的直接获取来的是全部信息，这样的信息是没有用的，所以必须要用 BeautifulSoup 来查找精确信息。在查找信息的时候，就需要一个工具将，请求得到的网页数据进行解析格式化。这个工具就是 lxml 库。

通俗语言解释：
比如你去了新华书店购买了一本书（requests），购买后你发现你看不懂这本书，因为全是英文。这个时候你需要一个翻译人员或者翻译工具（lxml 库）。当时翻译成中文后，你发现信息太多，要找到我的需要的信息太费时间。这个时候，你肯定很需要书的前有一个目录（BeautifulSoup），来精确查找你想要的信息。

如何利用 bs4 的 BeautifulSoup 抓取和筛选需要的数据：

当我们了解了 requests ，BeautifulSoup 和 lxml 三者之间的关系后，就可以愉快地的写代码啦。

在这个之前我们需要安装 bs4 库和 lxml 库 。不会的请看：《第4课：在 Pycharm 编译器里，如何安装库模块包》

#encoding:utf-8
from bs4 import BeautifulSoup
import requests
requ = requests.get("https://www.csdn.net/")
print(requ)
infos = BeautifulSoup(requ.text,'lxml')
print(text)

得到结果如下：

D:\you_names\venv\Scripts\python.exe D:/you_names/第一课学习.py
<Response [200]>
<!DOCTYPE html>
<html data-server-rendered="true" lang="zh"><head><title>CSDN - 专业开发者社区</title> <meta content="CSDN博客,CSDN学院,CSDN论坛,CSDN直播" name="keywords"/> <meta content="CSDN是全球知名中文IT技术交流平台,创建于1999年,包含原创博客、精品问答、职业培训、技术论坛、资源下载等产品服务,提供原创、优质、完整内容的专业IT技术开发社区." name="description"/> <meta content="text/html;charset=utf-8" http-equiv="content-type"/> <meta content="initial-scale=1, maximum-scale=1, user-scalable=no, minimal-ui" name="viewport"/> <meta content="always" name="referrer"/> <!-- --> <!-- --> <!-- --> <link href="https://g.csdnimg.cn/static/logo/favicon.ico" rel="shortcut icon" type="image/x-icon"/> <!-- -->
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class="icon_more" data-v-3b15931d=""></i></a> <ul class="moreData" data-v-3b15931d="" style="display:none;"></ul></li></ul></div> <div class="index_nav_right" data-v-3b15931d=""><ul class="nav_right_wrap" data-v-3b15931d=""><li data-report-view='{"spm":"1000.2115.3001.4126","dest":"https://live.csdn.net/","extra":"{\"fId\":62,\"fName\":\"floor-nav\",\"compName\":\"index-nav\",\"compDataId\":\"index-nav\",\"fTitle\":\"\",\"pageId\":18}"}' data-v-3b15931d=""><a data-report-click='{"spm":"1000.2115.3001.4126","dest":"https://live.csdn.net/","extra":"{\"fId\":62,\"fName\":\"floor-nav\",\"compName\":\"index-nav\",\"compDataId\":\"index-nav\",\"fTitle\":\"\",\"pageId\":18}"}' data-report-query="spm=1000.2115.3001.4126" data-v-3b15931d="" href="https://live.csdn.net/" target="_blank"><img alt="直播" data-v-3b15931d="" src="https://img-home.csdnimg.cn/images/20200811110251.png"/> <span data-v-3b15931d="">直播</span></a></li><li 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data-report-click='{"spm":"1000.2115.3001.4126","dest":"https://edu.csdn.net/lc/","extra":"{\"fId\":62,\"fName\":\"floor-nav\",\"compName\":\"index-nav\",\"compDataId\":\"index-nav\",\"fTitle\":\"\",\"pageId\":18}"}' data-report-query="spm=1000.2115.3001.4126" data-v-3b15931d="" href="https://edu.csdn.net/lc/" target="_blank"><img alt="学习" data-v-3b15931d="" src="https://img-home.csdnimg.cn/images/20200811103908.png"/> <span data-v-3b15931d="">学习</span></a></li></ul></div></div></div></div><div class="editMode" data-editor='{"type":"floor","pageId":18,"floorId":321}' floor-index="1" id="floor-hot-topic_321"><div class="floor" data-query="csdn-homePage-hot-topic" data-v-6b76ee9c=""><div class="topic_wrap" data-v-6b76ee9c=""><div class="card_header" data-v-2242a21c="" data-v-6b76ee9c=""><div data-v-2242a21c=""><span class="icon card_icon" data-v-2242a21c="" style="background-image:url('https://img-home.csdnimg.cn/images/20200704010251.png');"></span> <em class="card_title" data-v-2242a21c="">热门话题</em></div> <!-- --> <div class="right-icon" data-v-2242a21c=""><!-- --> <!-- --> <!-- --></div></div> <div data-v-62bd07a5="" data-v-6b76ee9c=""><ul class="topic_ul" data-v-62bd07a5=""><li data-v-62bd07a5=""><a data-report-click='{"spm":"1000.2115.3001.4368","dest":"https://blog.csdn.net/weixin_39786569/article/details/109765171","extra":"{\"fId\":321,\"fName\":\"floor-hot-topic\",\"compName\":\"hot-topic\",\"compDataId\":\"csdn-homePage-hot-topic\",\"fTitle\":\"热门话题\",\"pageId\":18}"}' data-report-query="spm=1000.2115.3001.4368" data-report-view='{"spm":"1000.2115.3001.4368","dest":"https://blog.csdn.net/weixin_39786569/article/details/109765171","extra":"{\"fId\":321,\"fName\":\"floor-hot-topic\",\"compName\":\"hot-topic\",\"compDataId\":\"csdn-homePage-hot-topic\",\"fTitle\":\"热门话题\",\"pageId\":18}"}' data-v-62bd07a5="" href="https://blog.csdn.net/weixin_39786569/article/details/109765171" target="_blank"><img data-v-62bd07a5="" src="https://img-home.csdnimg.cn/images/20200928100827.jpg"/> <div class="info" data-v-62bd07a5=""><h2 data-v-62bd07a5="">#极客日报#</h2> <p class="desc1" data-v-62bd07a5="">英特尔 5.6 亿出售部分芯片业务，联发科接盘</p> <p class="desc2" data-v-62bd07a5="">英特尔 5.6 亿出售部分芯片业务，联发科接盘</p> <a class="inner_a" data-v-62bd07a5="" href="https://blog.csdn.net/weixin_39786569/article/details/109765171" target="_blank">查看更多 <i class="go_icon" data-v-62bd07a5=""></i></a></div></a></li><li data-v-62bd07a5=""><a data-report-click='{"spm":"1000.2115.3001.4368","dest":"https://blink.csdn.net/details/1023921","extra":"{\"fId\":321,\"fName\":\"floor-hot-topic\",\"compName\":\"hot-topic\",\"compDataId\":\"csdn-homePage-hot-topic\",\"fTitle\":\"热门话题\",\"pageId\":18}"}' data-report-query="spm=1000.2115.3001.4368" data-report-view='{"spm":"1000.2115.3001.4368","dest":"https://blink.csdn.net/details/1023921","extra":"{\"fId\":321,\"fName\":\"floor-hot-topic\",\"compName\":\"hot-topic\",\"compDataId\":\"csdn-homePage-hot-topic\",\"fTitle\":\"热门话题\",\"pageId\":18}"}' data-v-62bd07a5="" href="https://blink.csdn.net/details/1023921" target="_blank"><img data-v-62bd07a5="" src="https://img-home.csdnimg.cn/images/20201113015952.jpg"/> <div class="info" data-v-62bd07a5=""><h2 data-v-62bd07a5="">#热议#</h2> <p class="desc1" data-v-62bd07a5="">35岁+的程序员为什么容易被淘汰？</p> <p class="desc2" data-v-62bd07a5="">35岁+的程序员为什么容易被淘汰？</p> <a class="inner_a" data-v-62bd07a5="" href="https://blink.csdn.net/details/1023921" target="_blank">查看更多 <i class="go_icon" data-v-62bd07a5=""></i></a></div></a></li><li data-v-62bd07a5=""><a data-report-click='{"spm":"1000.2115.3001.4368","dest":"https://blink.csdn.net/details/1024562","extra":"{\"fId\":321,\"fName\":\"floor-hot-topic\",\"compName\":\"hot-topic\",\"compDataId\":\"csdn-homePage-hot-topic\",\"fTitle\":\"热门话题\",\"pageId\":18}"}' data-report-query="spm=1000.2115.3001.4368" data-report-view='{"spm":"1000.2115.3001.4368","dest":"https://blink.csdn.net/details/1024562","extra":"{\"fId\":321,\"fName\":\"floor-hot-topic\",\"compName\":\"hot-topic\",\"compDataId\":\"csdn-homePage-hot-topic\",\"fTitle\":\"热门话题\",\"pageId\":18}"}' data-v-62bd07a5="" href="https://blink.csdn.net/details/1024562" target="_blank"><img data-v-62bd07a5="" src="https://img-home.csdnimg.cn/images/20201104093103.png"/> <div class="info" data-v-62bd07a5=""><h2 data-v-62bd07a5="">#话题#</h2> <p class="desc1" data-v-62bd07a5="">中外程序员都是怎么炫富的？</p> <p class="desc2" data-v-62bd07a5="">中外程序员都是怎么炫富的？</p> <a class="inner_a" data-v-62bd07a5="" href="https://blink.csdn.net/details/1024562" target="_blank">查看更多 <i class="go_icon" data-v-62bd07a5=""></i></a></div></a></li><li data-v-62bd07a5=""><a data-report-click='{"spm":"1000.2115.3001.4368","dest":"https://blink.csdn.net/details/1024003","extra":"{\"fId\":321,\"fName\":\"floor-hot-topic\",\"compName\":\"hot-topic\",\"compDataId\":\"csdn-homePage-hot-topic\",\"fTitle\":\"热门话题\",\"pageId\":18}"}' data-report-query="spm=1000.2115.3001.4368" data-report-view='{"spm":"1000.2115.3001.4368","dest":"https://blink.csdn.net/details/1024003","extra":"{\"fId\":321,\"fName\":\"floor-hot-topic\",\"compName\":\"hot-topic\",\"compDataId\":\"csdn-homePage-hot-topic\",\"fTitle\":\"热门话题\",\"pageId\":18}"}' data-v-62bd07a5="" href="https://blink.csdn.net/details/1024003" target="_blank"><img data-v-62bd07a5="" src="https://img-home.csdnimg.cn/images/20201102033736.png"/> <div class="info" data-v-62bd07a5=""><h2 data-v-62bd07a5="">#接龙#</h2> <p class="desc1" data-v-62bd07a5="">程序员“凡尔赛”文学</p> <p class="desc2" data-v-62bd07a5="">程序员“凡尔赛”文学</p> <a class="inner_a" data-v-62bd07a5="" href="https://blink.csdn.net/details/1024003" target="_blank">查看更多 <i class="go_icon" data-v-62bd07a5=""></i></a></div></a></li><li data-v-62bd07a5=""><a data-report-click='{"spm":"1000.2115.3001.4368","dest":"https://blink.csdn.net/details/1024024","extra":"{\"fId\":321,\"fName\":\"floor-hot-topic\",\"compName\":\"hot-topic\",\"compDataId\":\"csdn-homePage-hot-topic\",\"fTitle\":\"热门话题\",\"pageId\":18}"}' data-report-query="spm=1000.2115.3001.4368" data-report-view='{"spm":"1000.2115.3001.4368","dest":"https://blink.csdn.net/details/1024024","extra":"{\"fId\":321,\"fName\":\"floor-hot-topic\",\"compName\":\"hot-topic\",\"compDataId\":\"csdn-homePage-hot-topic\",\"fTitle\":\"热门话题\",\"pageId\":18}"}' data-v-62bd07a5="" href="https://blink.csdn.net/details/1024024" target="_blank"><img data-v-62bd07a5="" src="https://img-home.csdnimg.cn/images/20201016030850.png"/> <div class="info" data-v-62bd07a5=""><h2 data-v-62bd07a5="">#话题#</h2> <p class="desc1" data-v-62bd07a5="">荣耀品牌脱离华为正式独立，你还会继续购买荣耀手机吗?</p> <p class="desc2" data-v-62bd07a5="">荣耀品牌脱离华为正式独立，你还会继续购买荣耀手机吗?</p> <a class="inner_a" data-v-62bd07a5="" href="https://blink.csdn.net/details/1024024" target="_blank">查看更多 <i class="go_icon" data-v-62bd07a5=""></i></a></div></a></li><li data-v-62bd07a5=""><a data-report-click='{"spm":"1000.2115.3001.4368","dest":"https://live.csdn.net/v/89951","extra":"{\"fId\":321,\"fName\":\"floor-hot-topic\",\"compName\":\"hot-topic\",\"compDataId\":\"csdn-homePage-hot-topic\",\"fTitle\":\"热门话题\",\"pageId\":18}"}' data-report-query="spm=1000.2115.3001.4368" data-report-view='{"spm":"1000.2115.3001.4368","dest":"https://live.csdn.net/v/89951","extra":"{\"fId\":321,\"fName\":\"floor-hot-topic\",\"compName\":\"hot-topic\",\"compDataId\":\"csdn-homePage-hot-topic\",\"fTitle\":\"热门话题\",\"pageId\":18}"}' data-v-62bd07a5="" href="https://live.csdn.net/v/89951" target="_blank"><img data-v-62bd07a5="" src="https://img-home.csdnimg.cn/images/20201104065004.png"/> <div class="info" data-v-62bd07a5=""><h2 data-v-62bd07a5="">#短视频#</h2> <p class="desc1" data-v-62bd07a5="">AI还原乾隆后妃样貌，延禧攻略众生相</p> <p class="desc2" data-v-62bd07a5="">AI还原乾隆后妃样貌，延禧攻略众生相</p> <a class="inner_a" data-v-62bd07a5="" href="https://live.csdn.net/v/89951" target="_blank">查看更多 <i class="go_icon" data-v-62bd07a5=""></i></a></div></a></li><li data-v-62bd07a5=""><a data-report-click='{"spm":"1000.2115.3001.4368","dest":"https://blink.csdn.net/details/1023087","extra":"{\"fId\":321,\"fName\":\"floor-hot-topic\",\"compName\":\"hot-topic\",\"compDataId\":\"csdn-homePage-hot-topic\",\"fTitle\":\"热门话题\",\"pageId\":18}"}' data-report-query="spm=1000.2115.3001.4368" data-report-view='{"spm":"1000.2115.3001.4368","dest":"https://blink.csdn.net/details/1023087","extra":"{\"fId\":321,\"fName\":\"floor-hot-topic\",\"compName\":\"hot-topic\",\"compDataId\":\"csdn-homePage-hot-topic\",\"fTitle\":\"热门话题\",\"pageId\":18}"}' data-v-62bd07a5="" href="https://blink.csdn.net/details/1023087" target="_blank"><img data-v-62bd07a5="" src="https://img-home.csdnimg.cn/images/20201106105757.png"/> <div class="info" data-v-62bd07a5=""><h2 data-v-62bd07a5="">#话题#</h2> <p class="desc1" data-v-62bd07a5="">对着答案敲代码是坏习惯吗？</p> <p class="desc2" data-v-62bd07a5="">对着答案敲代码是坏习惯吗？</p> <a class="inner_a" data-v-62bd07a5="" href="https://blink.csdn.net/details/1023087" target="_blank">查看更多 <i class="go_icon" data-v-62bd07a5=""></i></a></div></a></li><li data-v-62bd07a5=""><a data-report-click='{"spm":"1000.2115.3001.4368","dest":"https://blink.csdn.net/details/849624","extra":"{\"fId\":321,\"fName\":\"floor-hot-topic\",\"compName\":\"hot-topic\",\"compDataId\":\"csdn-homePage-hot-topic\",\"fTitle\":\"热门话题\",\"pageId\":18}"}' data-report-query="spm=1000.2115.3001.4368" data-report-view='{"spm":"1000.2115.3001.4368","dest":"https://blink.csdn.net/details/849624","extra":"{\"fId\":321,\"fName\":\"floor-hot-topic\",\"compName\":\"hot-topic\",\"compDataId\":\"csdn-homePage-hot-topic\",\"fTitle\":\"热门话题\",\"pageId\":18}"}' data-v-62bd07a5="" href="https://blink.csdn.net/details/849624" target="_blank"><img data-v-62bd07a5="" src="https://img-home.csdnimg.cn/images/20201028020528.png"/> <div class="info" data-v-62bd07a5=""><h2 data-v-62bd07a5="">#讨论#</h2> <p class="desc1" data-v-62bd07a5="">学编程时，你会查看官方文档吗？</p> <p class="desc2" data-v-62bd07a5="">学编程时，你会查看官方文档吗？</p> <a class="inner_a" data-v-62bd07a5="" href="https://blink.csdn.net/details/849624" target="_blank">查看更多 <i class="go_icon" data-v-62bd07a5=""></i></a></div></a></li></ul></div></div></div></div><div class="editMode" data-editor='{"type":"floor","pageId":18,"floorId":322}' floor-index="2" id="floor-choosed-top_322"><div class="floor" data-query="csdn-homePage-chosen-news,operate_head" data-v-362aa3f8=""><div data-v-362aa3f8=""><div class="card_header" data-v-2242a21c="" data-v-362aa3f8=""><div data-v-2242a21c=""><span class="icon card_icon" data-v-2242a21c=""></span> <em class="card_title" data-v-2242a21c="">精选头条</em></div> <!-- --> <div class="right-icon" data-v-2242a21c=""><!-- --> <!-- --> <!-- --></div></div> <div class="top_content" data-v-362aa3f8=""><div class="top_warp" data-v-15854b2a="" data-v-362aa3f8=""><ul class="top_ul" data-v-15854b2a=""><li class="left_li" data-v-15854b2a=""><a data-report-click='{"spm":"1000.2115.3001.4373","dest":"https://csdnnews.blog.csdn.net/article/details/109771915","extra":"{\"fId\":322,\"fName\":\"floor-choosed-top\",\"compName\":\"choosed-top\",\"compDataId\":\"csdn-homePage-chosen-news\",\"fTitle\":\"精选头条\",\"pageId\":18}"}' data-report-query="spm=1000.2115.3001.4373" 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Process finished with exit code 0

代码解释：
from bs4 import BeautifulSoup ：这个意思是从 bs4 对象中导入了 BeautifulSoup 类。
from ： (表示起始点)从…起，始于，来自。
bs4 ：全称是Beatiful Soup （中文意思：美味的汤） 功能是用来筛选和抓取 HTML 信息的。

bs4 的 Beautiful Soup 详细解释：

为什么要取 bs4 这个名字呢？

在 Beautiful Soup官网 Why is it called “BeautifulSoup”? 里有提到：

Back in 2004 most parsers could only parse well-formed XML and HTML. The poorly-formed stuff you saw on the Web was referred to as “tag soup”, and only a web browser could parse it. Beautiful Soup started out as an HTML parser that would take tag soup and make it beautiful, or at least workable.

大致意思：Beautiful soup和传统的tag soup对应，希望改进传统的不好的格式。

Tag Soup的来源：

在英文WIki tag soup 里有定义，第一小段如下：

In web development, “tag soup” is a pejorative term that refers to syntactically or structurally incorrect HTML written for a web page. Because web browsers have historically treated HTML syntax or structural errors leniently, there has been little pressure for web developers to follow published standards, and therefore there is a need for all browser implementations to provide mechanisms to cope with the appearance of “tag soup”, accepting and correcting for invalid syntax and structure where possible.

HTML是有一堆标签tag组成的，soup可以理解成一碗汤，装了很多标签，因此tag soup就是一碗标签汤。这个翻译有点牵强。题主 @FelicieDeLuxe 在评论里想到一个好翻译：一锅大杂烩。

soup 也可以理解成集合，因此tag soup就是标签集合。这个更好理解些。

所以是就取了一个 BeautifulSoup 名字。

那为什么是 4 ，不是 1，2，3，？因为在 bs 更新到了 4 版本目前为止是Beautiful Soup 4.9.3 版本

在bs4 对象中有4个不同功能的类分别是：

Tag 类：是html中的一个标签，用BeautifulSoup就能解析出来Tag的具体内容。

BeautifulSoup 类： 默认是获取整个 html 信息

NavigableString 类：标签内的文本对象

Comment 类：是一个特殊的NavigableString对象，如果html标签内存在注释，那么它可以过滤掉注释符号保留注释文本

最常用的还是 BeautifulSoup 对象和 Tag 对象

import ：导入，引用等意思
BeautifulSoup ：功能作用：获取整个 html 信息

所以整体 from bs4 import BeautifulSoup 的意思就是从 bs4 对象中导入了 BeautifulSoup

请牢记，其中导入的思路，后续中不在讲解。

代码解释：

text = BeautifulSoup(requ.text,'lxml')

text ：是一个变量名字。上一课解释说了。
requ.text ：请求网站的内容
lxml ：用 lxml 这个库工具去解析requ.text 得到的内容，让人能看的懂的信息。现在目前为止你只要知道这是一个解析 HTML 代码的工具就行。以后也是用这个工具。

如果我们需要精确查找某个数据，就需要这样格式写：BeautifulSoup(requ.text,‘lxml’) ，这个意思是让请求得到数据，转换成一个类似书本的目录。然后得到目录后，我们就可以精确查找了。用到的功能是 BeautifulSoup 类中的 find() 和 find_all () 函数的功能。

代码演示【获取CSDN 的文章标题】：

#encoding:utf-8
from bs4 import BeautifulSoup
import requests
requ = requests.get("https://www.csdn.net/")
infos = BeautifulSoup(requ.text,'lxml')
datas = infos.find_all('p',class_="headP")
for d in datas:zhongwen = d.textprint(zhongwen)

得到结果如下：

D:\pro_py\venv\Scripts\python.exe D:/pro_py/教育学习/7.py腾讯 AI 医学进展破解“秃头”难题，登 Nature 子刊！
魔幻离现实仅一步之遥：细说Python的循环调用、循环引用和循环导入
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**上述代码涉及到了两个知识点，一个 HTML 基础，一个是 for 循环。还有一个 list **

HTML 基础：

什么是 html :

html 全称：htper text markup language，意思是：超文本标记(标签)语言，是用来编写 web 网页的一种语言。

网页的组成:

网页是网站中的其中一页，就好像一本书是个网站，网页就是一本书中的一页纸。主要以HTML 语言的标签，属性，样式，表单等组成，并在其中插入图片，音频，视频，动画等媒体文件形成了网页。

HTML 代码演示：

<!DOCTYPE html>
<html lang="en"><head><meta charset="UTF-8"><title>网页标题</title></head><body  bgcolor="red" text="blue">宋哈哈 python 基础教学</body>
</html>

其中 html ，head ，meta，title，body , 这些都叫做标签
其中 lang='en’ ，charset=“UTF-8”，bgcolor=“red”，text=“blue” 都叫做标签的属性。
lang，charset，bgcolor，text 都叫做属性名
'en’ ，“UTF-8”，“red”，“blue” 这些都叫做属性值

其中 “网页标题” ， “宋哈哈 python 基础教学” ，这个中文字体，默认都是网页中显示的字。

总体解释如下：

<标签名属性名=“属性值”>内容</标签名>

凡是 <> 里面**靠左边**的英文单词【不管出现的是什么英文单词】都叫做标签，而出现 = 号左右的一个叫标签的属性名，一个叫标签的属性值。

例如上述，爬虫获取标题代码中的一句代码：

datas = infos.find_all('p',class_="headP")

find_all ：查找所有的意思

这句代码的整体意思是：在infos 中解析到的HTML代码中查找所有的 class 的属性值为 “headP” 的 p 标签的数据，并赋值到 datas 中

list 学习：

list 直接翻译过来就是列表，什么是列表呢？

中文汉字翻译为：以表格为容器，装载着文字或图表的一种形式，叫列表，如下图所示：

在Python中，怎么去表达列表呢？在中括号中装着字符串，数字，变量，函数，等值，并且用英文逗号，分割。如下：

['LightPink','浅粉红','LavenderBlush','淡紫红','LavenderBlush','淡紫红']

你们自行判断之间的不同。在中文解释中，分开文字的是 | ，而在pyton中是，。

在中文解释，我们在excel 创建了一个列表，默认都是有名字的哟叫 sheet ，所有我们在 python 创建列表的时候，也需要给它取一个名字。
我这里给它取了一个 newlist ，所以就写成：

newlist = ['LightPink','浅粉红','LavenderBlush','淡紫红','LavenderBlush','淡紫红']

如果我们要打印出那些数据，该怎么打印出来？这个时候有两种办法：

切片：就好像有一根 4节的竹子，我需要那一节或者那几节，就直接在那里切断【具体不在详解，后面遇到在讲解，在这里需要理解这个意思就行】
for ：遍历列表，将每个值都打印输出出来。

for 循环基础学习：

for 英文解释为：（表示对象、用途等）给，对；为了；关于；代表；受雇于；意思是；支持；因为；为得到；换取；就……而言；……后（更好、更快乐等）；（表示去向）往；（安排或预定）在……时；对（某人）来说（困难、必需、愉快等）；以……为价格；（表示一段时间）计；表示一系列事件之一。

在了解 for 之前，我们需要在了解一个关键词遍历：

遍历：所谓遍历(Traversal)，是指沿着某条搜索路线，依次对树（或图）中每个节点均做一次访问。如图所示：

我们看到了图片所表达的，就是一个一个寻找。就好像，你掉了一个东西，有可能是 ABC 三个点，然后你开始从 A点，然后找B点，在找C点，这一个过程叫做遍历。

for 的使用方法：

代码演示如下：

newlist = ['LightPink','浅粉红','LavenderBlush','淡紫红','LavenderBlush','淡紫红']
for n in newlist:print(n)

得到结果如下：

D:\pro_py\venv\Scripts\python.exe D:/pro_py/教育学习/7.py
LightPink
浅粉红
LavenderBlush
淡紫红
LavenderBlush
淡紫红Process finished with exit code 0

for 语法格式：

for n in newlist:print(n)

n ：表示的是我遍历 newlist 的每一个值的名字。这个名字就叫做变量名了
in ：在里面的意思。
print(n)：就是输出打印出来 newlist 的每一个值。
整体意思：就是遍历 newlist 列表，当n 等于 newlist 第一个值的时候，打印出来，等于第二值的时候，打印出来，以此类推。知道遍历完整个列表。

目前为止，你们只要这样理解for 循环就行。

变量名：

变量名其实也和赋值一样，只不过后面的值，是一直在变化，附你身上的鬼，有多种鬼附身，色鬼，贪吃鬼，吊死鬼等等都可以附在你身上。总是变来变去，所以叫变量名。

为什么find_all 要用 for 才能打印出来呢?

因为 find_all 查找出的数据，默认都是用列表形式存储，所以我们需要用 for 把这个列表遍历打印出来，才能看到完整的信息。

回顾一下整体代码

#encoding:utf-8
from bs4 import BeautifulSoup
import requests
requ = requests.get("https://www.csdn.net/")
infos = BeautifulSoup(requ.text,'lxml')
datas = infos.find_all('p',class_="headP")
for d in datas:zhongwen = d.textprint(zhongwen)

我们注意到了，变量 d 后面还有一个 .text ，这个意思是，获取 html代码中的所有中文字符串。

演示如下：

不加 text 代码如下：

#encoding:utf-8
from bs4 import BeautifulSoup
import requests
requ = requests.get("https://www.csdn.net/")
infos = BeautifulSoup(requ.text,'lxml')
datas = infos.find_all('p',class_="headP")
for d in datas:print(d)

得到结果如下：

D:\pro_py\venv\Scripts\python.exe D:/pro_py/教育学习/7.py
<p class="headP" data-v-4e870765="">腾讯 AI 医学进展破解“秃头”难题，登 Nature 子刊！</p>
<p class="headP" data-v-4e870765="">魔幻离现实仅一步之遥：细说Python的循环调用、循环引用和循环导入</p>
<p class="headP" data-v-4e870765="">Vue 新 ref 语法糖提案引热议</p>
<p class="headP" data-v-4e870765="">深入剖析Linux内核反向映射机制</p>
<p class="headP" data-v-4e870765="">我坦白！我是第五位飞上太空的程序员游客</p>
<p class="headP" data-v-4e870765="">倪光南、求伯君“出山”：爱解 Bug、无惧“35岁魔咒”、编码之路痛并快乐！</p>
<p class="headP" data-v-4e870765="">苹果被曝重大系统漏洞：新款MacBook、iPhone 12统统波及，root权限秒被获取</p>
<p class="headP" data-v-b98d3800="">Java8编程实战</p>
<p class="headP" data-v-b98d3800="">面试之排序算法</p>
<p class="headP" data-v-b98d3800="">实用数据分析：数据分析师从小白到精通</p>
Process finished with exit code 0

我们看到了还有自带有 html 标签属性等信息，如果要直接获取到中文文本字符串信息，就需要在 d 后面加 text 。

加 text 代码如下：

#encoding:utf-8
from bs4 import BeautifulSoup
import requests
requ = requests.get("https://www.csdn.net/")
infos = BeautifulSoup(requ.text,'lxml')
datas = infos.find_all('p',class_="headP")
for d in datas:print(d.text) # 加了text

得到结果如下：

D:\pro_py\venv\Scripts\python.exe D:/pro_py/教育学习/7.py
腾讯 AI 医学进展破解“秃头”难题，登 Nature 子刊！
魔幻离现实仅一步之遥：细说Python的循环调用、循环引用和循环导入
Vue 新 ref 语法糖提案引热议
深入剖析Linux内核反向映射机制
我坦白！我是第五位飞上太空的程序员游客
倪光南、求伯君“出山”：爱解 Bug、无惧“35岁魔咒”、编码之路痛并快乐！
苹果被曝重大系统漏洞：新款MacBook、iPhone 12统统波及，root权限秒被获取
Java8编程实战
面试之排序算法
实用数据分析：数据分析师从小白到精通
Process finished with exit code 0

课程总结：

本节课学习 BeautifulSoup 的 find_all 来根据标签的属性。找到我们需要的精确信息。

在这课程中我需要了解 html 代码，需要了解用for 循环遍历 list ，这些基础知识。目前为止大家只要这么理解就行，更深层的理解，建议自行查询百度或者CSDN。

在学习某个库或者某个函数使用的时候，我建议是要用到的时候，再去深入了解这个。

本节课作业：

爬去搜狐新闻的文章标题名称：

搜狐新闻：

写好的代码，请发在评论区。

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第7课： bs4 库的 BeautifulSoup 基础学习

这里写目录标题

本节课内容所需要安装的库：

BeautifulSoup 简介：

lxml 简介：

requests ，BeautifulSoup 和 lxml 相互三者关系：

如何利用 bs4 的 BeautifulSoup 抓取和筛选需要的数据：

bs4 的 Beautiful Soup 详细解释：

HTML 基础：

什么是 html :

网页的组成:

list 学习：

for 循环基础学习：

for 的使用方法：

变量名：

为什么find_all 要用 for 才能打印出来呢?

回顾一下整体代码

课程总结：

第7课： bs4 库的 BeautifulSoup 基础学习相关推荐

最新文章

热门文章

第7课： bs4 库 的 BeautifulSoup 基础学习

这里写目录标题

本节课内容所需要安装的 库：

BeautifulSoup 简介：

lxml 简介：

requests ，BeautifulSoup 和 lxml 相互三者关系：

如何利用 bs4 的 BeautifulSoup 抓取和筛选需要的数据：

bs4 的 Beautiful Soup 详细解释：

HTML 基础：

什么是 html :

网页的组成:

list 学习：

for 循环基础学习：

for 的使用方法：

变量名：

为什么find_all 要用 for 才能打印出来呢?

回顾一下整体代码

课程总结：

第7课： bs4 库 的 BeautifulSoup 基础学习相关推荐

最新文章

热门文章

第7课： bs4 库的 BeautifulSoup 基础学习

本节课内容所需要安装的库：

第7课： bs4 库的 BeautifulSoup 基础学习相关推荐