关于scrapy入门级代码tutorial示例代码无法获得item的原因

        "http://www.dmoz.org/Computers/Programming/Languages/Python/Books/",  
        "http://www.dmoz.org/Computers/Programming/Languages/Python/Resources/"  

这两个网站结构已经改变了，不再是ul/li的格式

网上流传的dmoz_spider.py代码为：

from scrapy.spider import Spider
from scrapy.selector import Selector

from tutorial.items import DmozItem

class DmozSpider(Spider):
name = "dmoz"
allowed_domains = ["dmoz.org"]
start_urls = [
"http://www.dmoz.org/Computers/Programming/Languages/Python/Books/",
"http://www.dmoz.org/Computers/Programming/Languages/Python/Resources/"
]

def parse(self, response):
sel = Selector(response)
sites = sel.xpath('//ul[@class="directory-url"]/li')
items = []
for site in sites:
item = DmozItem()
item['title'] = site.xpath('a/text()').extract()
item['link'] = site.xpath('a/@href').extract()
item['desc'] = site.xpath('text()').extract()
items.append(item)
return items

改变后dmoz_spider.py的代码为，items.py文件不变：

from scrapy.spider import Spider
from scrapy.selector import Selector
from tutorial.items import DmozItem
class DmozSpider(Spider):
name = "dmoz"
allowed_domains = ["dmoz.org"]
start_urls = [
<pre name="code" class="python">        "http://www.dmoz.org/Computers/Programming/Languages/Python/Books/",
"http://www.dmoz.org/Computers/Programming/Languages/Python/Resources/"

] def parse(self, response): sel = Selector(response) sites = sel.xpath('//div[@class="title-and-desc"]') items = [] for site in sites: item = DmozItem() item['title'] = site.xpath('a/div[@class="site-title"]/text()').extract() item['link']=site.xpath('a/@href').extract()
item['desc']=site.xpath('div/text()').extract() items.append(item) return items

编辑日期：2016年11月5日02:14:05