class EastSpider(scrapy.Spider):
    name = 'East'
    allowed_domains = ['****.com']
    start_urls = ['http://finance.***.com/news.html']

    def parse(self, response):
        nextUrl = response.xpath('//*[contains(@class,"page-btn")]/@href')
        for url in nextUrl.extract():
            time.sleep(1)
            yield Request(urljoin(response.url,url))

        contentUrl = response.xpath('//p[@class="title"]/a/@href')
        for urls in contentUrl.extract():
            time.sleep(1)
            yield Request(urls,callback = self.parse)

        pass

代码如上，但是在命令行运行scrapy crawl East -o East.csv的结果，East.csv是个空文件，什么都没写进去。
我看人家说要yield，但是自己搞了搞也没行...
尝试了在for循环之外添加yield url、yield urls报错，说是在定义之前引用了，然后在for循环之内添加又没效果，还是空文件...