modify class attrib selector

newsspider/spiders/bjxpv.py

@@ -14,11 +14,10 @@ class BjxpvSpider(scrapy.Spider):
             yield scrapy.Request(url, self.news_parse)
 
         next_page = response.xpath('//a[contains(text(), "下一页")]')
-        if next_page.attrib['class'] != 'disable':
+        if next_page.attrib.get('class') != 'disable':
             url = next_page.attrib['href']
             yield response.follow(url, self.parse)
 
-
     def news_parse(self, response):
         news_item = NewsItem()
         news_item['website'] = '北极星太阳能光伏网'