python - Limit how much elements scrapy can collect -

i using scrapy collect data. scrapy program collects 100 elements @ 1 session. need limit 50 or random number. how can that? solution welcomed. in advance

# -*- coding: utf-8 -*- import re import scrapy   class dmozitem(scrapy.item):     # define fields item here like:     link = scrapy.field()     attr = scrapy.field()     title = scrapy.field()     tag = scrapy.field()   class dmozspider(scrapy.spider):     name = "dmoz"     allowed_domains = ["raleigh.craigslist.org"]     start_urls = [         "http://raleigh.craigslist.org/search/bab"     ]      base_url = 'http://raleigh.craigslist.org/'      def parse(self, response):         links = response.xpath('//a[@class="hdrlnk"]/@href').extract()         link in links:             absolute_url = self.base_url + link             yield scrapy.request(absolute_url, callback=self.parse_attr)      def parse_attr(self, response):         match = re.search(r"(\w+)\.html", response.url)         if match:             item_id = match.group(1)             url = self.base_url + "reply/ral/bab/" + item_id              item = dmozitem()             item["link"] = response.url             item["title"] = "".join(response.xpath("//span[@class='postingtitletext']//text()").extract())             item["tag"] = "".join(response.xpath("//p[@class='attrgroup']/span/b/text()").extract()[0])             return scrapy.request(url, meta={'item': item}, callback=self.parse_contact)      def parse_contact(self, response):         item = response.meta['item']         item["attr"] = "".join(response.xpath("//div[@class='anonemail']//text()").extract())         return item 

this closespider extension , closespider_itemcount setting made for:

an integer specifies number of items. if spider scrapes more amount if items , items passed item pipeline, spider closed reason closespider_itemcount. if 0 (or non set), spiders won’t closed number of passed items.