Scrapy不会将数据写入文件

Question

他在Scrapy中创建了一个蜘蛛：items.py：from scrapy.item import Item, Fieldclass dns_shopItem (Item):     # Define the fields for your item here like:     # Name = Field ()     id = Field ()     idd = Field ()dns_shop_spider.py：from scrapy.contrib.spiders import CrawlSpider, Rulefrom scrapy.contrib.linkextractors.sgml import SgmlLinkExtractorfrom scrapy.contrib.loader.processor import TakeFirstfrom scrapy.contrib.loader import XPathItemLoaderfrom scrapy.selector import HtmlXPathSelectorfrom dns_shop.items import dns_shopItem class dns_shopLoader (XPathItemLoader):     default_output_processor = TakeFirst () class dns_shopSpider (CrawlSpider):    name = "dns_shop_spider"    allowed_domains = ["www.playground.ru"]    start_urls = ["http://www.playground.ru/files/stalker_clear_sky/"]    rules = (    Rule (SgmlLinkExtractor (allow = ('/ files / s_t_a_l_k_e_r_chistoe_nebo')), follow = True),    Rule (SgmlLinkExtractor (allow = ('/ files / s_t_a_l_k_e_r_chistoe_nebo')), callback = 'parse_item'),    )    def parse_item (self, response):        hxs = HtmlXPathSelector (response)        l = dns_shopLoader (dns_shopItem (), hxs)        l.add_xpath ('id', "/ html / body / table [2] / tbody / tr [5] / td [2] / table / tbody / tr / td / div [6] / h1/text ()" )        l.add_xpath ('idd', "/ / html / body / table [2] / tbody / tr [5] / td [2] / table / tbody / tr / td / div [6] / h1/text () ")        return l.load_item ()运行以下命令：scrapy crawl dns_shop_spider-o scarped_data_utf8.csv-t csv此日志显示Scrapy遍历了所有必需的URL，但是为什么在启动Spider时不将其写入指定的文件。可能是什么问题？