Item Exporters Using Item Exporters Serialization of item fields 1. Declaring a serializer in the field 2. Overriding the serialize_field() method Built-in Item Exporters refer...

Requests and Responses Request objects Passing additional data to callback functions Using errbacks to catch exceptions in request processing Request.meta special keys bindaddre...

Spider Middleware Activating a spider middleware Writing your own spider middleware Built-in spider middleware reference DepthMiddleware HttpErrorMiddleware HttpErrorMiddleware ...

Spider Middleware Activating a spider middleware Writing your own spider middleware Built-in spider middleware reference DepthMiddleware HttpErrorMiddleware HttpErrorMiddleware ...

爬虫搜索策略 广度优先搜索和深度优先搜索 Scrapy是以广度优先还是深度优先进行爬取的呢？ 爬虫搜索策略 在爬虫系统中，待抓取URL队列是很重要的一部分。待抓取URL队列中的URL以什么样的顺序排列也是一个很重要的问题，因为这涉及到先抓取那个页面，后抓取哪个页面。而决定这些URL排列顺序的方法，叫做抓取策略。 1、 深度优先搜索策略（顺藤摸瓜...

Release notes Contributing to Scrapy Versioning and API stability

借助Firefox来爬取 在浏览器中检查DOM的注意事项 对爬取有帮助的实用Firefox插件 Firebug XPather XPath Checker Tamper Data Firecookie 借助Firefox来爬取 这里介绍一些使用Firefox进行爬取的点子及建议，以及一些帮助爬取的Firefox实用插件。 在浏览器...

Item Exporters Using Item Exporters Serialization of item fields 1. Declaring a serializer in the field 2. Overriding the serialize_field() method Built-in Item Exporters refer...

Item Exporters Using Item Exporters Serialization of item fields 1. Declaring a serializer in the field 2. Overriding the serialize_field() method Built-in Item Exporters refer...

Item Exporters Using Item Exporters Serialization of item fields 1. Declaring a serializer in the field 2. Overriding the serialize_field() method Built-in Item Exporters refer...