03.数据解析的三大兄弟

着重回顾一下爬虫分类中,需求为75%的聚焦爬虫:爬取页面中指定的内容。

用正则表达式来批量找到要下载的图片地址

format %d来表达需要递增的页面,其使用方式是前面需要标记一个%d用来表达该位置插入一个整型数字,后面的%表示变量的计算方式。举个例子,比如

Age =18.5   # 底层逻辑是int(18.5)

Print(‘年龄是:%d’  % age)

输出结果就会是18.

爬虫还有一类问题比较常见,就是出现乱码,需要匹配网页和爬虫输出的编码

在爬取58二手房信息时候,出现了无法获取信息的情况,原来是这些网站做了反爬,只需要在浏览器中点一下验证就好了。

无论是正则表达式,beautifulsoup、xpath其实都需要通过requests来获取网页数据,然后分别导入到各自的实例化对象里,再根据各自的特点方法,去解析、和匹配寻找我们要的信息。

109 thoughts on “03.数据解析的三大兄弟

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