知行编程网知行编程网  2022-05-28 08:00 知行编程网 隐藏边栏 |   抢沙发  23 
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『爬虫四步走』手把手教你使用Python抓取并存储网页数据!

爬虫是Python的一个重要的应用,使用Python爬虫我们可以轻松的从互联网中抓取我们想要的数据,本文将基于爬取B站视频热搜榜单数据并存储为例,详细介绍Python爬虫的基本流程。如果你还在入门爬虫阶段或者不清楚爬虫的具体工作流程,那么应该仔细阅读本文!


  第一步:尝试请求

首先进入b站首页,点击排行榜并复制链接


现在启动Jupyter notebook,并运行以下代码

在上面的代码中,我们完成了下面三件事

  • 导入requests
  • 使用get方法构造请求
  • 使用status_code获取网页状态码

可以看到返回值是200,表示服务器正常响应,这意味着我们可以继续进行。


  第二步:解析页面


在上一步我们通过requests向网站请求数据后,成功得到一个包含服务器资源的Response对象,现在我们可以使用.text来查看其内容

『爬虫四步走』手把手教你使用Python抓取并存储网页数据!

可以看到返回一个字符串,里面有我们需要的热榜视频数据,但是直接从字符串中提取内容是比较复杂且低效的,因此我们需要对其进行解析,将字符串转换为网页结构化数据,这样可以很方便地查找HTML标签以及其中的属性和内容。

在Python中解析网页的方法有很多,可以使用正则表达式,也可以使用BeautifulSouppyquerylxml,本文将基于BeautifulSoup进行讲解.

Beautiful Soup是一个可以从HTML或XML文件中提取数据的第三方库.安装也很简单,使用pip install bs4安装即可,下面让我们用一个简单的例子说明它是怎样工作的

在上面的代码中,我们通过bs4中的BeautifulSoup类将上一步得到的html格式字符串转换为一个BeautifulSoup对象,注意在使用时需要制定一个解析器,这里使用的是html.parser

接着就可以获取其中的某个结构化元素及其属性,比如使用soup.title.text获取页面标题,同样可以使用soup.bodysoup.p等获取任意需要的元素。


  第三步:提取内容


在上面两步中,我们分别使用requests向网页请求数据并使用bs4解析页面,现在来到最关键的步骤:如何从解析完的页面中提取需要的内容

Beautiful Soup中,我们可以使用find/find_all来定位元素,但我更习惯使用CSS选择器.select,因为可以像使用CSS选择元素一样向下访问DOM树。

现在我们用代码讲解如何从解析完的页面中提取B站热榜的数据,首先我们需要找到存储数据的标签,在榜单页面按下F12并按照下图指示找到

『爬虫四步走』手把手教你使用Python抓取并存储网页数据!

可以看到每一个视频信息都被包在class="rank-item"li标签下,那么代码就可以这样写👇

在上面的代码中,我们先使用soup.select('li.rank-item'),此时返回一个list包含每一个视频信息,接着遍历每一个视频信息,依旧使用CSS选择器来提取我们要的字段信息,并以字典的形式存储在开头定义好的空列表中。

可以注意到我用了多种选择方法提取去元素,这也是select方法的灵活之处,感兴趣的读者可以进一步自行研究。


  第四步:存储数据


通过前面三步,我们成功的使用requests+bs4从网站中提取出需要的数据,最后只需要将数据写入Excel中保存即可。

如果你对pandas不熟悉的话,可以使用csv模块写入,需要注意的是设置好编码encoding='utf-8-sig',否则会出现中文乱码的问题

如果你熟悉pandas的话,更是可以轻松将字典转换为DataFrame,一行代码即可完成

)

『爬虫四步走』手把手教你使用Python抓取并存储网页数据!


  小结


至此我们就成功使用Python将b站热门视频榜单数据存储至本地,大多数基于requests的爬虫基本都按照上面四步进行。

不过虽然看上去简单,但是在真实场景中每一步都没有那么轻松,从请求数据开始目标网站就有多种形式的反爬、加密,到后面解析、提取甚至存储数据都有很多需要进一步探索、学习。

本文选择B站视频热榜也正是因为它足够简单,希望通过这个案例让大家明白爬虫的基本流程,最后附上完整代码



end



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data-darkmode-original-color-15882384789136="rgb(0, 0, 0)" data-darkmode-bgimage-15882384789136="1" data-darkmode-bgcolor-15882396318564="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15882396318564="rgb(255, 255, 255)" data-darkmode-color-15882396318564="rgb(230, 230, 230)" data-darkmode-original-color-15882396318564="rgb(0, 0, 0)" data-darkmode-bgimage-15882396318564="1" data-darkmode-bgcolor-15900529136199="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15900529136199="rgb(255, 255, 255)" data-darkmode-color-15900529136199="rgb(230, 230, 230)" data-darkmode-original-color-15900529136199="rgb(0, 0, 0)" data-darkmode-bgimage-15900529136199="1" class="js_darkmode__bg__0 js_darkmode__8" style="padding: 18px 15px 20px 10px;background-size: 100% 100%;background-image: url('https://www.zkxjob.com/wp-content/uploads/2022/05/wxsync-2022-05-a2a8a5e1e58f30392066a170034ee027.png');color: rgb(86, 146, 214);letter-spacing: 1.5px;background-repeat: no-repeat;"><section data-darkmode-bgcolor-15860613985508="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15860613985508="rgb(255, 255, 255)" data-darkmode-color-15860613985508="rgb(230, 230, 230)" data-darkmode-original-color-15860613985508="rgb(0, 0, 0)" data-darkmode-bgimage-15860613985508="1" data-darkmode-bgcolor-15870356070738="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15870356070738="rgb(255, 255, 255)" data-darkmode-color-15870356070738="rgb(230, 230, 230)" data-darkmode-original-color-15870356070738="rgb(0, 0, 0)" data-darkmode-bgimage-15870356070738="1" data-darkmode-bgcolor-15870356071023="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15870356071023="rgb(255, 255, 255)" data-darkmode-color-15870356071023="rgb(230, 230, 230)" data-darkmode-original-color-15870356071023="rgb(0, 0, 0)" data-darkmode-bgimage-15870356071023="1" data-darkmode-bgcolor-15882384789136="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15882384789136="rgb(255, 255, 255)" data-darkmode-color-15882384789136="rgb(230, 230, 230)" data-darkmode-original-color-15882384789136="rgb(0, 0, 0)" data-darkmode-bgimage-15882384789136="1" data-darkmode-bgcolor-15882396318564="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15882396318564="rgb(255, 255, 255)" data-darkmode-color-15882396318564="rgb(230, 230, 230)" data-darkmode-original-color-15882396318564="rgb(0, 0, 0)" data-darkmode-bgimage-15882396318564="1" data-darkmode-bgcolor-15900529136199="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15900529136199="rgb(255, 255, 255)" data-darkmode-color-15900529136199="rgb(230, 230, 230)" data-darkmode-original-color-15900529136199="rgb(0, 0, 0)" data-darkmode-bgimage-15900529136199="1" style="display: flex;justify-content: center;align-items: center;"><section data-darkmode-bgcolor-15860613985508="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15860613985508="rgb(255, 255, 255)" data-darkmode-color-15860613985508="rgb(230, 230, 230)" data-darkmode-original-color-15860613985508="rgb(0, 0, 0)" data-darkmode-bgimage-15860613985508="1" data-darkmode-bgcolor-15870356070738="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15870356070738="rgb(255, 255, 255)" data-darkmode-color-15870356070738="rgb(230, 230, 230)" data-darkmode-original-color-15870356070738="rgb(0, 0, 0)" data-darkmode-bgimage-15870356070738="1" data-darkmode-bgcolor-15870356071023="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15870356071023="rgb(255, 255, 255)" data-darkmode-color-15870356071023="rgb(230, 230, 230)" data-darkmode-original-color-15870356071023="rgb(0, 0, 0)" data-darkmode-bgimage-15870356071023="1" data-darkmode-bgcolor-15882384789136="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15882384789136="rgb(255, 255, 255)" data-darkmode-color-15882384789136="rgb(230, 230, 230)" data-darkmode-original-color-15882384789136="rgb(0, 0, 0)" data-darkmode-bgimage-15882384789136="1" data-darkmode-bgcolor-15882396318564="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15882396318564="rgb(255, 255, 255)" data-darkmode-color-15882396318564="rgb(230, 230, 230)" data-darkmode-original-color-15882396318564="rgb(0, 0, 0)" data-darkmode-bgimage-15882396318564="1" data-darkmode-bgcolor-15900529136199="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15900529136199="rgb(255, 255, 255)" data-darkmode-color-15900529136199="rgb(230, 230, 230)" data-darkmode-original-color-15900529136199="rgb(0, 0, 0)" data-darkmode-bgimage-15900529136199="1" style="margin-left: 2px;width: 20px;"></section><section data-brushtype="text" data-darkmode-bgcolor-15860613985508="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15860613985508="rgb(255, 255, 255)" data-darkmode-color-15860613985508="rgb(51, 51, 51)" data-darkmode-original-color-15860613985508="rgb(51, 51, 51)" data-darkmode-bgimage-15860613985508="1" data-darkmode-bgcolor-15870356070738="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15870356070738="rgb(255, 255, 255)" data-darkmode-color-15870356070738="rgb(51, 51, 51)" data-darkmode-original-color-15870356070738="rgb(51, 51, 51)" data-darkmode-bgimage-15870356070738="1" data-darkmode-bgcolor-15870356071023="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15870356071023="rgb(255, 255, 255)" data-darkmode-color-15870356071023="rgb(51, 51, 51)" data-darkmode-original-color-15870356071023="rgb(51, 51, 51)" data-darkmode-bgimage-15870356071023="1" data-darkmode-bgcolor-15882384789136="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15882384789136="rgb(255, 255, 255)" data-darkmode-color-15882384789136="rgb(51, 51, 51)" data-darkmode-original-color-15882384789136="rgb(51, 51, 51)" data-darkmode-bgimage-15882384789136="1" data-darkmode-bgcolor-15882396318564="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15882396318564="rgb(255, 255, 255)" data-darkmode-color-15882396318564="rgb(51, 51, 51)" data-darkmode-original-color-15882396318564="rgb(51, 51, 51)" data-darkmode-bgimage-15882396318564="1" data-darkmode-bgcolor-15900529136199="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15900529136199="rgb(255, 255, 255)" data-darkmode-color-15900529136199="rgb(51, 51, 51)" data-darkmode-original-color-15900529136199="rgb(51, 51, 51)" data-darkmode-bgimage-15900529136199="1" style="font-size: 14px;color: rgb(51, 51, 51);text-align: left;"><span style="font-family: 楷体, 楷体_GB2312, SimKai;">点这里,获取新手福利</span></section></section></section></section></section></section></section>

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