保存图片方法
images_list=response.xpath("//div[@class='items']/ul/li/img/@bimg").extract()
aa = images_list[0].split('/')
result = requests.get(url=images_list[0])
image_name = 'images/'+aa[-1]
with open(image_name, 'wb+') as s:
s.write(result.content)
s.close()
