Scrapy 爬取
要执行你的蜘蛛，请在 _firstscrapy 目录中运行以下命令：
scrapy crawl first
其中， 首先 是创建蜘蛛时指定的蜘蛛名称。
一旦蜘蛛爬行，你可以看到下面的输出：
2016-08-09 18:13:07-0400 [scrapy] INFO: Scrapy started (bot: tutorial)
2016-08-09 18:13:07-0400 [scrapy] INFO: Optional features available: ...
2016-08-09 18:13:07-0400 [scrapy] INFO: Overridden settings: {}
2016-08-09 18:13:07-0400 [scrapy] INFO: Enabled extensions: ...
2016-08-09 18:13:07-0400 [scrapy] INFO: Enabled downloader middlewares: ...
2016-08-09 18:13:07-0400 [scrapy] INFO: Enabled spider middlewares: ...
2016-08-09 18:13:07-0400 [scrapy] INFO: Enabled item pipelines: ...
2016-08-09 18:13:07-0400 [scrapy] INFO: Spider opened
2016-08-09 18:13:08-0400 [scrapy] DEBUG: Crawled (200)
<GET http://www.dmoz.org/Computers/Programming/Languages/Python/Resources/> (referer: None)
2016-08-09 18:13:09-0400 [scrapy] DEBUG: Crawled (200)
<GET http://www.dmoz.org/Computers/Programming/Languages/Python/Books/> (referer: None)
2016-08-09 18:13:09-0400 [scrapy] INFO: Closing spider (finished)
正如您在输出中看到的那样，对于每个URL，都有一个日志行指出这些URL是起始URL，并且它们没有引用。接下来，您应该会在 _firstscrapy 目录中看到名为 Books.html 和 Resources.html的 两个新文件。