The script (below) from this tutorial contains two start_urls.
start_urls
from scrapy.spider import Spider from scrapy.selector import Selector from dirb
If you use BaseSpider, inside the callback, you have to extract out your desired urls yourself and return a Request object.
BaseSpider
Request
If you use CrawlSpider, links extraction would be taken care of by the rules and the SgmlLinkExtractor associated with the rules.
CrawlSpider