我用Scrappy和python3.6.8构建了sprider，并在运行sprider时记录了未完成的url：

self.urls.append(url) 

 item=myItem()
 item["mylink"]=url        
 yield scrapy.Request(            
       url="myurl",
       method='GET',
       headers=self.headers,
       callback=self.parse_detail,
       errback=self.make_new_request,
       meta={"item":item})

我尝试在蜘蛛类破坏之前重试未完成URL：

def __del__(self):
    print("\033[31myielded:",len(self.yielded),"scrapying:",len(self.urls),"\033[0m")
    if len(self.urls)>0:
        print(self.urls)
        print("\033[31mretry uncompleted\033[0m")
        self.RetryUncompletedUrls()

但蜘蛛只是打印和存在！我怎么能在蜘蛛完成之前重试操作？谢谢！