def links(self):
        """
        Return the URLs of all the links on a page together with information
        about their "rel" attribute, for determining which ones to treat as
        downloads and which ones to queue for further scraping.
        """
        def clean(url):
            "Tidy up an URL."
            scheme, netloc, path, params, query, frag = urlparse(url)
            return urlunparse((scheme, netloc, quote(path),
                               params, query, frag))

        result = set()
        for match in self._href.finditer(self.data):
            d = match.groupdict('')
            rel = (d['rel1'] or d['rel2'] or d['rel3'] or
                   d['rel4'] or d['rel5'] or d['rel6'])
            url = d['url1'] or d['url2'] or d['url3']
            url = urljoin(self.base_url, url)
            url = unescape(url)
            url = self._clean_re.sub(lambda m: '%%%2x' % ord(m.group(0)), url)
            result.add((url, rel))
        # We sort the result, hoping to bring the most recent versions
        # to the front
        result = sorted(result, key=lambda t: t[0], reverse=True)
        return result

        Return the URLs of all the links on a page together with information
        about their "rel" attribute, for determining which ones to treat as
        downloads and which ones to queue for further scraping.
        
product/gradle-plugin/src/main/python/pip/_vendor/distlib/locators.py