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python爬虫框架Scrapy实战案例!

马哥Linux运维 来源:lq 2018-12-07 16:12 次阅读

我们使用dmoz.org这个网站来作为小抓抓一展身手的对象。

首先先要回答一个问题。

问:把网站装进爬虫里,总共分几步?

答案很简单,四步:

新建项目 (Project):新建一个新的爬虫项目

明确目标(Items):明确你想要抓取的目标

制作爬虫(Spider):制作爬虫开始爬取网页

存储内容(Pipeline):设计管道存储爬取内容

好的,基本流程既然确定了,那接下来就一步一步的完成就可以了。

1.新建项目(Project)

在空目录下按住Shift键右击,选择“在此处打开命令窗口”,输入一下命令:

其中,tutorial为项目名称。

可以看到将会创建一个tutorial文件夹,目录结构如下:

下面来简单介绍一下各个文件的作用:

scrapy.cfg:项目的配置文件

tutorial/:项目的Python模块,将会从这里引用代码

tutorial/items.py:项目的items文件

tutorial/pipelines.py:项目的pipelines文件

tutorial/settings.py:项目的设置文件

tutorial/spiders/:存储爬虫的目录

2.明确目标(Item)

在Scrapy中,items是用来加载抓取内容的容器,有点像Python中的Dic,也就是字典,但是提供了一些额外的保护减少错误。

一般来说,item可以用scrapy.item.Item类来创建,并且用scrapy.item.Field对象来定义属性(可以理解成类似于ORM的映射关系)。

接下来,我们开始来构建item模型(model)。

首先,我们想要的内容有:

名称(name)

链接(url)

描述(description)

修改tutorial目录下的items.py文件,在原本的class后面添加我们自己的class。

因为要抓dmoz.org网站的内容,所以我们可以将其命名为DmozItem:

刚开始看起来可能会有些看不懂,但是定义这些item能让你用其他组件的时候知道你的 items到底是什么。

可以把Item简单的理解成封装好的类对象。

3.制作爬虫(Spider)

制作爬虫,总体分两步:先爬再取。

也就是说,首先你要获取整个网页的所有内容,然后再取出其中对你有用的部分。

3.1爬

Spider是用户自己编写的类,用来从一个域(或域组)中抓取信息

他们定义了用于下载的URL列表、跟踪链接的方案、解析网页内容的方式,以此来提取items。

要建立一个Spider,你必须用scrapy.spider.BaseSpider创建一个子类,并确定三个强制的属性:

name:爬虫的识别名称,必须是唯一的,在不同的爬虫中你必须定义不同的名字。

start_urls:爬取的URL列表。爬虫从这里开始抓取数据,所以,第一次下载的数据将会从这些urls开始。其他子URL将会从这些起始URL中继承性生成。

parse():解析的方法,调用的时候传入从每一个URL传回的Response对象作为唯一参数,负责解析并匹配抓取的数据(解析为item),跟踪更多的URL。

这里可以参考宽度爬虫教程中提及的思想来帮助理解,教程传送:[Java] 知乎下巴第5集:使用HttpClient工具包和宽度爬虫。

也就是把Url存储下来并依此为起点逐步扩散开去,抓取所有符合条件的网页Url存储起来继续爬取。

下面我们来写第一只爬虫,命名为dmoz_spider.py,保存在tutorial\spiders目录下。

dmoz_spider.py代码如下:

allow_domains是搜索的域名范围,也就是爬虫的约束区域,规定爬虫只爬取这个域名下的网页。

从parse函数可以看出,将链接的最后两个地址取出作为文件名进行存储。

然后运行一下看看,在tutorial目录下按住shift右击,在此处打开命令窗口,输入:

运行结果如图:

报错了:

UnicodeDecodeError: 'ascii' codec can't decode byte 0xb0 in position 1: ordinalnot in range(128)

运行第一个Scrapy项目就报错,真是命运多舛。

应该是出了编码问题,谷歌了一下找到了解决方案:

在python的Lib\site-packages文件夹下新建一个sitecustomize.py:

再次运行,OK,问题解决了,看一下结果:

最后一句INFO: Closing spider (finished)表明爬虫已经成功运行并且自行关闭了。

包含 [dmoz]的行 ,那对应着我们的爬虫运行的结果。

可以看到start_urls中定义的每个URL都有日志行。

还记得我们的start_urls吗?

http://www.dmoz.org/Computers/Programming/Languages/Python/Bookshttp://www.dmoz.org/Computers/Programming/Languages/Python/Resources

因为这些URL是起始页面,所以他们没有引用(referrers),所以在它们的每行末尾你会看到 (referer: )。

在parse 方法的作用下,两个文件被创建:分别是 Books 和 Resources,这两个文件中有URL的页面内容。

那么在刚刚的电闪雷鸣之中到底发生了什么呢?

首先,Scrapy为爬虫的 start_urls属性中的每个URL创建了一个 scrapy.http.Request 对象 ,并将爬虫的parse 方法指定为回调函数。

然后,这些 Request被调度并执行,之后通过parse()方法返回scrapy.http.Response对象,并反馈给爬虫。

3.2取

爬取整个网页完毕,接下来的就是的取过程了。

光存储一整个网页还是不够用的。

在基础的爬虫里,这一步可以用正则表达式来抓。

在Scrapy里,使用一种叫做 XPath selectors的机制,它基于 XPath表达式。

如果你想了解更多selectors和其他机制你可以查阅相关资料

这是一些XPath表达式的例子和他们的含义

/html/head/title: 选择HTML文档元素下面的 <a href="https://m.hqchip.com/tags" target="_blank"><u>标签</u></a>。</p> <p style="text-indent: 2em;"> /html/head/title/text(): 选择前面提到的<title> 元素下面的文本内容</p> <p style="text-indent: 2em;"> //td: 选择所有 <td> 元素</p> <p style="text-indent: 2em;"> //div[@class="mine"]: 选择所有包含 class="mine" 属性的div 标签元素</p> <p style="text-indent: 2em;"> 以上只是几个使用XPath的简单例子,但是实际上XPath非常强大。</p> <p style="text-indent: 2em;"> 为了方便使用XPaths,Scrapy提供XPathSelector 类,有两种可以选择,HtmlXPathSelector(HTML数据解析)和XmlXPathSelector(XML数据解析)。</p> <p style="text-indent: 2em;"> 必须通过一个 Response 对象对他们进行实例化操作。</p> <p style="text-indent: 2em;"> 你会发现Selector对象展示了文档的节点结构。因此,第一个实例化的selector必与根节点或者是整个目录有关 。</p> <p style="text-indent: 2em;"> 在Scrapy里面,Selectors 有四种基础的方法(点击查看API文档):</p> <p style="text-indent: 2em;"> xpath():返回一系列的selectors,每一个select表示一个xpath参数表达式选择的节点</p> <p style="text-indent: 2em;"> css():返回一系列的selectors,每一个select表示一个css参数表达式选择的节点</p> <p style="text-indent: 2em;"> extr<a href="https://www.hqchip.com/app/1703" target="_blank"><u>ac</u></a>t():返回一个unicode字符串,为选中的数据</p> <p style="text-indent: 2em;"> re():返回一串一个unicode字符串,为使用正则表达式抓取出来的内容</p> <p style="text-indent: 2em;"> 3.3xpath实验</p> <p style="text-indent: 2em;"> 下面我们在Shell里面尝试一下Selector的用法。</p> <p style="text-indent: 2em;"> 实验的网址:http://www.dmoz.org/Computers/Programming/Languages/Python/Books/</p> <p align="center"> <img src="http://file.elecfans.com/web1/M00/7D/BB/pIYBAFwKK3OAMag2AAB7_dZ30Cg048.png" /></p> <p style="text-indent: 2em;"> 熟悉完了实验的小白鼠,接下来就是用Shell爬取网页了。</p> <p style="text-indent: 2em;"> 进入到项目的顶层目录,也就是第一层tutorial文件夹下,在cmd中输入:</p> <p style="text-indent: 2em;"> <img src="http://file.elecfans.com/web1/M00/7D/BB/pIYBAFwKK3OAUgvEAAAvjyHSf78514.png" /></p> <p style="text-indent: 2em;"> 回车后可以看到如下的内容:</p> <p align="center"> <img src="http://file.elecfans.com/web1/M00/7D/BB/pIYBAFwKK3SATik7AAHbS5Z2YkQ587.png" /></p> <p style="text-indent: 2em;"> 在Shell载入后,你将获得response回应,存储在本地变量 response中。</p> <p style="text-indent: 2em;"> 所以如果你输入response.body,你将会看到response的body部分,也就是抓取到的页面内容:</p> <p align="center"> <img src="http://file.elecfans.com/web1/M00/7D/BB/pIYBAFwKK3aAFYdPAALND72cYfk023.png" /></p> <p style="text-indent: 2em;"> 或者输入response.headers 来查看它的 header部分:</p> <p align="center"> <img src="http://file.elecfans.com/web1/M00/7D/BB/pIYBAFwKK3mAe8tVAALBJa2ARnE086.png" /></p> <p style="text-indent: 2em;"> 现在就像是一大堆沙子握在手里,里面藏着我们想要的金子,所以下一步,就是用筛子摇两下,把杂质出去,选出关键的内容。</p> <p style="text-indent: 2em;"> selector就是这样一个筛子。</p> <p style="text-indent: 2em;"> 在旧的版本中,Shell实例化两种selectors,一个是解析HTML的 hxs 变量,一个是解析XML 的 xxs 变量。</p> <p style="text-indent: 2em;"> 而现在的Shell为我们准备好的selector对象,sel,可以根据返回的数据类型自动选择最佳的解析方案(XML or HTML)。</p> <p style="text-indent: 2em;"> 然后我们来捣弄一下!~</p> <p style="text-indent: 2em;"> 要彻底搞清楚这个问题,首先先要知道,抓到的页面到底是个什么样子。</p> <p style="text-indent: 2em;"> 比如,我们要抓取网页的标题,也就是<title>这个标签:</p> <p align="center"> <img src="http://file.elecfans.com/web1/M00/7D/BB/pIYBAFwKK3mAYZubAAAMzxt2yJ4194.png" /></p> <p style="text-indent: 2em;"> 可以输入:</p> <p style="text-indent: 2em;"> <img src="http://file.elecfans.com/web1/M00/7D/BB/pIYBAFwKK3mAdRyfAAAHpvVtoOo344.png" /></p> <p style="text-indent: 2em;"> 结果就是:</p> <p style="text-indent: 2em;"> <img src="http://file.elecfans.com/web1/M00/7D/BB/pIYBAFwKK3qAQejMAAAvPB0_p9g042.png" /></p> <p style="text-indent: 2em;"> 这样就能把这个标签取出来了,用extract()和text()还可以进一步做处理。</p> <p style="text-indent: 2em;"> 备注:简单的罗列一下有用的xpath路径表达式:</p> <p style="text-indent: 2em;"> 表达式</p> <p style="text-indent: 2em;"> 描述</p> <p style="text-indent: 2em;"> nodename 选取此节点的所有子节点。 </p> <p style="text-indent: 2em;"> / 从根节点选取。 </p> <p style="text-indent: 2em;"> // 从匹配选择的当前节点选择文档中的节点,而不考虑它们的位置。 </p> <p style="text-indent: 2em;"> . 选取当前节点。 </p> <p style="text-indent: 2em;"> .. 选取当前节点的父节点。 </p> <p style="text-indent: 2em;"> @ 选取属性。 </p> <p style="text-indent: 2em;"> 全部的实验结果如下,In[i]表示第i次实验的输入,Out[i]表示第i次结果的输出:</p> <p align="center"> <img src="http://file.elecfans.com/web1/M00/7D/BB/pIYBAFwKK3qAVtJSAABq5y-5nTo180.png" /></p> <p style="text-indent: 2em;"> 当然title这个标签对我们来说没有太多的价值,下面我们就来真正抓取一些有意义的东西。</p> <p style="text-indent: 2em;"> 使用火狐的审查元素我们可以清楚地看到,我们需要的东西如下:</p> <p align="center"> <img src="http://file.elecfans.com/web1/M00/7D/BB/pIYBAFwKK3uAdCiqAABSVCIAudw253.png" /></p> <p style="text-indent: 2em;"> 我们可以用如下代码来抓取这个<li>标签:</p> <p style="text-indent: 2em;"> <img src="http://file.elecfans.com/web1/M00/7D/BB/pIYBAFwKK3uAEGbvAAAGwo7Xx3w887.png" /></p> <p style="text-indent: 2em;"> 从<li>标签中,可以这样获取网站的描述:</p> <p style="text-indent: 2em;"> <img src="http://file.elecfans.com/web1/M00/7D/BB/pIYBAFwKK3yAVaxqAAALDd45q6Y420.png" /></p> <p style="text-indent: 2em;"> 可以这样获取网站的标题:</p> <p style="text-indent: 2em;"> <img src="http://file.elecfans.com/web1/M00/7D/BB/pIYBAFwKK3yALz5oAAALFMU58tc217.png" /></p> <p style="text-indent: 2em;"> 可以这样获取网站的超链接:</p> <p style="text-indent: 2em;"> <img src="http://file.elecfans.com/web1/M00/7D/BB/pIYBAFwKK3yAb7ArAAALbImHF8A623.png" /></p> <p style="text-indent: 2em;"> 当然,前面的这些例子是直接获取属性的方法。</p> <p style="text-indent: 2em;"> 我们注意到xpath返回了一个对象列表,</p> <p style="text-indent: 2em;"> 那么我们也可以直接调用这个列表中对象的属性挖掘更深的节点</p> <p style="text-indent: 2em;"> (参考:Nesting selectorsandWorking with relative XPathsin theSelectors):</p> <p align="center"> <img src="http://file.elecfans.com/web1/M00/7D/BB/pIYBAFwKK3yAKXYOAAAFlcs_O2Q945.png" /></p> <p style="text-indent: 2em;"> 3.4xpath实战</p> <p style="text-indent: 2em;"> 我们用shell做了这么久的实战,最后我们可以把前面学习到的内容应用到dmoz_spider这个爬虫中。</p> <p style="text-indent: 2em;"> 在原爬虫的parse函数中做如下修改:</p> <p align="center"> <img src="http://file.elecfans.com/web1/M00/7D/BB/pIYBAFwKK32APDm_AABf9RQ21Ug644.png" /></p> <p style="text-indent: 2em;"> 注意,我们从scrapy.selector中导入了Selector类,并且实例化了一个新的Selector对象。这样我们就可以像Shell中一样操作xpath了。</p> <p style="text-indent: 2em;"> 我们来试着输入一下命令运行爬虫(在tutorial根目录里面):</p> <p style="text-indent: 2em;"> scrapy crawl dmoz</p> <p style="text-indent: 2em;"> 运行结果如下:</p> <p align="center"> <img src="http://file.elecfans.com/web1/M00/7D/BB/pIYBAFwKK36Acd2dAAFYpLNs00Y419.png" /></p> <p style="text-indent: 2em;"> 果然,成功的抓到了所有的标题。但是好像不太对啊,怎么Top,Python这种导航栏也抓取出来了呢?</p> <p style="text-indent: 2em;"> 我们只需要红圈中的内容:</p> <p align="center"> <img src="http://file.elecfans.com/web1/M00/7D/BB/pIYBAFwKK36AOjgYAACr0aW5qJA726.png" /></p> <p style="text-indent: 2em;"> 看来是我们的xpath语句有点问题,没有仅仅把我们需要的项目名称抓取出来,也抓了一些无辜的但是xpath语法相同的元素。</p> <p style="text-indent: 2em;"> 审查元素我们发现我们需要的<ul>具有class='directory-url'的属性,</p> <p style="text-indent: 2em;"> 那么只要把xpath语句改成sel.xpath('//ul[@class="directory-url"]/li')即可</p> <p style="text-indent: 2em;"> 将xpath语句做如下调整:</p> <p align="center"> <img src="http://file.elecfans.com/web1/M00/7D/BB/pIYBAFwKK3-ACJoMAABs7DrGtok960.png" /></p> <p style="text-indent: 2em;"> 成功抓出了所有的标题,绝对没有滥杀无辜:</p> <p align="center"> <img src="http://file.elecfans.com/web1/M00/7D/BB/pIYBAFwKK4CAHGdkAAGerLsr9Lo332.png" /></p> <p style="text-indent: 2em;"> 3.5使用Item</p> <p style="text-indent: 2em;"> 接下来我们来看一看如何使用Item。</p> <p style="text-indent: 2em;"> 前面我们说过,Item 对象是自定义的python字典,可以使用标准字典语法获取某个属性的值:</p> <p align="center"> <img src="http://file.elecfans.com/web1/M00/7D/BB/pIYBAFwKK4GASXyKAAAbv4i09k4540.png" /></p> <p style="text-indent: 2em;"> 作为一只爬虫,Spiders希望能将其抓取的数据存放到Item对象中。为了返回我们抓取数据,spider的最终代码应当是这样:</p> <p align="center"> <img src="http://file.elecfans.com/web1/M00/7D/BB/pIYBAFwKK4GASocHAACB7Ri1uLE782.png" /></p> <p style="text-indent: 2em;"> 4.存储内容(Pipeline)</p> <p style="text-indent: 2em;"> 保存信息的最简单的方法是通过Feed exports,主要有四种:JSON,JSON lines,CSV,XML。</p> <p style="text-indent: 2em;"> 我们将结果用最常用的JSON导出,命令如下:</p> <p style="text-indent: 2em;"> <img src="http://file.elecfans.com/web1/M00/7D/BB/pIYBAFwKK4GAHhJ1AAAJ_lLGWaQ037.png" /></p> <p style="text-indent: 2em;"> -o 后面是导出文件名,-t 后面是导出类型。</p> <p style="text-indent: 2em;"> 然后来看一下导出的结果,用文本编辑器打开json文件即可(为了方便显示,在item中删去了除了title之外的属性):</p> <p align="center"> <img src="http://file.elecfans.com/web1/M00/7D/BB/pIYBAFwKK4KACVqfAAIE9eyo2bQ297.png" /></p> <p style="text-indent: 2em;"> 因为这个只是一个小型的例子,所以这样简单的处理就可以了。</p> <p style="text-indent: 2em;"> 如果你想用抓取的items做更复杂的事情,你可以写一个 Item Pipeline(条目管道)。</p> <!-- <iframe id="articleDetailIframe" src="about:blank" frameborder="0" width="100%" scrolling="no"></iframe> <div id="articleDetailContent" class="simditor-body" style="display: none;"></div> --> </div> <div class="statement2"> 声明:本文内容及配图由入驻作者撰写或者入驻合作网站授权转载。文章观点仅代表作者本人,不代表电子发烧友网立场。文章及其配图仅供工程师学习之用,如有内容侵权或者其他违规问题,请联系本站处理。 <a class="complaint handleJumpBy" href="/about/tousu.html" target="_blank">举报投诉</a> </div> <ul class="hot-main clearfix" style="text-align: right; "> <li data-href="https://www.elecfans.com/tags/python/"> <span>python</span> <div class="hot-des"> <div class="detail"> <div class="top clearfix"> <div class="lf title"> <a 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$(".close_verification:eq(0)").click( function (e) { e.stopPropagation(); $.ajax({ url: www_host + '/webapi/Mcenter/sms/getvalidstatus', type: "post", dataType: 'json', success: function ( res) { if (res.data .phonestatus == 0) { layer .msg( "请先验证手机号" ) } else { $(".pop_verification_mask") .remove() } } }) }) }) } else { _iframe = '<div class="pop_verification_mask"><div class="pop_verification phone_verification">' + '<h6>请验证手机<i class="close_icon_d close_verification">╳</i></h6>' + '<div class="desc_txt">尊敬的用户:<br>' + phoneTxt + '</div>' + '<iframe class="phone_iframe" id="verificationIframe" width="488" height="580" src="' + passport + '/Security/validatePhone/siteid/14.html"></iframe>' + '</div></div>' $('body').append(_iframe).ready(function () { $(".close_verification:eq(0)").click( function (e) { e.stopPropagation(); $(".pop_verification").remove() if ($(".pop_verification_mask") .length >= 1) { $(".pop_verification_mask") .remove() } }); }) } } //已经验证手机号 if 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