+class YoutubeTopListIE(YoutubePlaylistIE):
+ IE_NAME = u'youtube:toplist'
+ IE_DESC = (u'YouTube.com top lists, "yttoplist:{channel}:{list title}"'
+ u' (Example: "yttoplist:music:Top Tracks")')
+ _VALID_URL = r'yttoplist:(?P<chann>.*?):(?P<title>.*?)$'
+
+ def _real_extract(self, url):
+ mobj = re.match(self._VALID_URL, url)
+ channel = mobj.group('chann')
+ title = mobj.group('title')
+ query = compat_urllib_parse.urlencode({'title': title})
+ playlist_re = 'href="([^"]+?%s[^"]+?)"' % re.escape(query)
+ channel_page = self._download_webpage('https://www.youtube.com/%s' % channel, title)
+ link = self._html_search_regex(playlist_re, channel_page, u'list')
+ url = compat_urlparse.urljoin('https://www.youtube.com/', link)
+
+ video_re = r'data-index="\d+".*?data-video-id="([0-9A-Za-z_-]{11})"'
+ ids = []
+ # sometimes the webpage doesn't contain the videos
+ # retry until we get them
+ for i in itertools.count(0):
+ msg = u'Downloading Youtube mix'
+ if i > 0:
+ msg += ', retry #%d' % i
+ webpage = self._download_webpage(url, title, msg)
+ ids = orderedSet(re.findall(video_re, webpage))
+ if ids:
+ break
+ url_results = self._ids_to_results(ids)
+ return self.playlist_result(url_results, playlist_title=title)