将用两个规则替换预定义的规则变量，一个用于水平，一个用于垂直爬
rules = ( Rule(LinkExtractor(restrict_xpaths=‘//*[contains(@class,"next")]‘)), Rule(LinkExtractor(restrict_xpaths=‘//*[@itemprop="url"]‘), callback=‘parse_item‘) )
将用两个规则替换预定义的规则变量，一个用于水平，一个用于垂直爬
rules = ( Rule(LinkExtractor(restrict_xpaths=‘//*[contains(@class,"next")]‘)), Rule(LinkExtractor(restrict_xpaths=‘//*[@itemprop="url"]‘), callback=‘parse_item‘) )
原文：http://www.cnblogs.com/realmonkeykingsun/p/8031322.html