python爬虫 豆瓣电影Top250数据分析与可视化

上传者: TYJ20170916 | 上传时间: 2023-02-20 14:39:18 | 文件大小: 127.76MB | 文件类型: RAR
python爬虫 豆瓣电影Top250数据分析与可视化(应用Flask框架、Echarts、WordCloud等技术)爬虫简单的来说就是用程序获取网络上数据这个过程的一种名称。 爬虫的原理 如果要获取网络上数据,我们要给爬虫一个网址(程序中通常叫URL),爬虫发送一个HTTP请求给目标网页的服务器,服务器返回数据给客户端(也就是我们的爬虫),爬虫再进行数据解析、保存等一系列操作。 流程 爬虫可以节省我们的时间,比如我要获取豆瓣电影 Top250 榜单,如果不用爬虫,我们要先在浏览器上输入豆瓣电影的 URL ,客户端(浏览器)通过解析查到豆瓣电影网页的服务器的 IP 地址,然后与它建立连接,浏览器再创造一个 HTTP 请求发送给豆瓣电影的服务器,服务器收到请求之后,把 Top250 榜单从数据库中提出,封装成一个 HTTP 响应,然后将响应结果返回给浏览器,浏览器显示响应内容,我们看到数据。我们的爬虫也是根据这个流程,只不过改成了代码形式。

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