def _extract_info(self, url):
mobj = re.match(self._VALID_URL, url)
video_id = mobj.group('id')
- display_id = mobj.group('display_id') or video_id
+ display_id = (mobj.group('display_id')
+ if 'display_id' in mobj.groupdict()
+ else None) or mobj.group('id')
webpage = self._download_webpage(
url, display_id, headers={'Cookie': 'age_verified=1'})