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Scrapy 入门
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<p><img src="/images/2018-08-31-fgg.png"><br><img src="/images/2018-08-31-CH2kvQ.png"></p>
<span id="more"></span>
<p>运行方式</p>
<ol>
<li><p>交互式解析器</p>
</li>
<li><p>命令行脚本</p>
</li>
<li><p>集成开发环境</p>
</li>
</ol>
<h2 id="Pip"><a href="#Pip" class="headerlink" title="Pip"></a>Pip</h2><figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">pip install package</span><br><span class="line">pip uninstall package</span><br><span class="line">pip list</span><br><span class="line">pip show</span><br><span class="line">pip install virtualenv</span><br></pre></td></tr></table></figure>
<h2 id="Requests"><a href="#Requests" class="headerlink" title="Requests"></a>Requests</h2><ul>
<li>发起请求</li>
<li>获取请求返回状态码</li>
<li>获取请求返回头部信息</li>
<li>获取请求返回内容</li>
</ul>
<h2 id="BeautifulSoup"><a href="#BeautifulSoup" class="headerlink" title="BeautifulSoup"></a>BeautifulSoup</h2><p>解析 HTML、XML 文档、修复含有未闭合标签等错误的文档，为待解析的页面建立一棵树，以便提取其中的数据。</p>
<h2 id="Scrapy"><a href="#Scrapy" class="headerlink" title="Scrapy"></a>Scrapy</h2><blockquote>
<p>Scrapy 是快速高级的 web 爬虫框架，用于抓取网站并从网页中提取结构化数据。</p>
</blockquote>
<p>优势</p>
<ol>
<li>HTML, XML 源数据 选择及提取 的内置支持</li>
<li>通过 feed 导出 提供了多格式(JSON、CSV、XML)，多存储后端(FTP、S3、本地文件系统)的内置支持<br>提供了 media pipeline，可以 自动下载 爬取到的数据中的图片(或者其他资源)。</li>
<li>内置的中间件及扩展为下列功能提供了支持:<br>cookies and session 处理<br>HTTP 压缩<br>HTTP 认证<br>HTTP 缓存</li>
</ol>
<h3 id="运行环境"><a href="#运行环境" class="headerlink" title="运行环境"></a>运行环境</h3><ul>
<li>Python 2.7 or Python 3.4+</li>
<li>Works on Linux, Windows, Mac OSX, BSD</li>
</ul>
<h3 id="核心组件"><a href="#核心组件" class="headerlink" title="核心组件"></a>核心组件</h3><ol>
<li><p>Spider</p>
<blockquote>
<p>用户定义爬取动作、分析爬取数据的地方</p>
</blockquote>
<p><code>name</code>： 定义 spider 名字，必须是唯一的<br><code>start_urls</code>：指定了一组 URLs 告诉 spider 从什么地方开始去进行爬取<br><code>parse</code>：当 response 没有指定回调函数时，该方法是 Scrapy 处理下载的 response 的默认方法</p>
</li>
<li><p>Item</p>
<p>Item对象是中简单的容器，保存爬取得到的数据。提供了类似词典的api用于声明可用字段的简单语法</p>
</li>
<li><p>Pipelines<br>接收从 spider 中返回的 Item，通过 pipeline 的各个组件决定是否继续处理数据还是丢弃数据不再处理。主要功能如下：</p>
<ul>
<li>清理数据</li>
<li>验证数据</li>
<li>数据查重</li>
<li>数据储存</li>
</ul>
</li>
<li><p>Middlewares</p>
<ul>
<li><p>Downloader middlewares（下载中件）： 在网页在下载前、后进行逻辑处理</p>
</li>
<li><p>Spider middlewares（爬虫中件）：调用爬虫输入下载结果和输出请求/数据时进行逻辑处理</p>
</li>
</ul>
</li>
<li><p>Scrapy Engine(引擎)</p>
<p> 核心引擎，负责控制和调度各个组件，保证数据流转</p>
</li>
<li><p>Scheduler（调度器）</p>
<p> 负责管理任务、过滤任务、输出任务的调度器，存储、去重任务都在此控制；</p>
</li>
<li><p>Downloader </p>
<p> 载器，负责在网络上下载网页数据，输入待下载URL，输出下载结果</p>
<p> <img src="/images/2018-08-31-scrapy_architecture.png"></p>
</li>
</ol>
<h2 id="Pyspider"><a href="#Pyspider" class="headerlink" title="Pyspider"></a>Pyspider</h2><p> 自带WebUI的界面， 配置灵活性没Scrapy高。
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