擅长:python、mysql、java
<p>根据Scrapy文档,您使用的<code>.css(selector)</code>方法返回一个<a href="https://doc.scrapy.org/en/latest/topics/selectors.html#scrapy.selector.SelectorList" rel="nofollow noreferrer">SelectorList</a>实例。如果需要url的实际(unicode)字符串版本,请调用<code>extract()</code>方法:</p>
<pre><code>def parse(self, response):
for url in response.css('table a::attr("href")').extract():
yield(scrapy.Request(response.urljoin(url), self.parse_topics))
</code></pre>