1、问题描述:
实现定位<h2>品牌</h2>节点
brand_tag = sel.xpath("//h2[text()= '品牌']")
报错:ValueError: All strings must be XML compatible: Unicode or ASCII, no NULL bytes or control characters
2、解决方法:
(1)brand = u'品牌'
brand_tag = sel.xpath("//h2[text()= '%s']"%(brand))
(2)brand_tag = sel.xpath(u"//h2[text()= '品牌']")
http://blog.csdn.net/zcc_0015/article/details/52274996