刮痕链接抽取器或规则不工作

我一直试图让Scrapy的LinkedExtractor工作,但没有结果。

from scrapy.spiders import Rule, CrawlSpider
from scrapy.linkextractors import LinkExtractor


class TestSpider(CrawlSpider):
    name = 'spi'
    allowed_domains = ['https://www.reddit.com/']
    start_urls = ['https://www.reddit.com/']

    rules = [
        Rule(LinkExtractor(allow=()),
             callback='detail', follow=True)
    ]

    def parse(self, response):
        print("parsed!")

    def detail(self, response):
        print('parsed detail!')

当我使用命令“scrapy craw spi”运行爬行器时: