if response.xpath('//link[contains(@rel,"apple-touch-icon-precomposed")]/@href') : apple_touch_url = response.xpath('//link[contains(@rel,"apple-touch-icon-precomposed")]/@href').extract() apple_touch_url=[link for link in apple_touch_url if 'https' in link or 'http' in link ] item['logo'] = apple_touch_url if not apple_touch_url: ‘这里没有这个列表我想走 elif 的逻辑’但是好像没有这样的语法,求人指教,谢谢