python - Rename Files Downloaded Via Scrapy -

i starting out scrapy , i'm trying rename every image download item['title']

here spider:

import scrapy botname.items import botname   class botname(scrapy.spider):     name = "bot"     allowed_domains = "example.com"     start_urls = [         "http://example.com&pageno=%s"         % page page in xrange(1, 3)         ]      def parse(self, response):         sel in response.xpath('//html'):             item = mybotitem()             # want name files result of             item['title'] = sel.xpath('//h5/text()').extract()             item['image_urls'] = sel.xpath('//img/@data-zoom-image').extract()             yield item 

and pipeline class

class mybotpipeline(object):      def process_item(self, item, spider):         return item      def file_path(self, request, response=none, info=none):         image_guid = request.meta['title'][0]         log.msg(image_guid, level=log.debug)         return 'full/%s' % (image_guid)      def get_media_requests(self, item, info):         image_url in item['image_urls']:             yield request(image_url)      def item_completed(self, results, item, info):         image_paths = [x['path'] ok, x in results if ok]         if not image_paths:             raise dropitem("item contains no images")         item['image_paths'] = image_paths         return item