- self._sort_formats(info['formats'])
- info['id'] = lecture_id if not multipart else '%s_part%s' % (lecture_id, part_id)
- info['display_id'] = lecture_slug if not multipart else '%s_part%s' % (lecture_slug, part_id)
+ info['id'] = lecture_id if not multipart else f'{lecture_id}_part{part_id}'
+ info['display_id'] = lecture_slug if not multipart else f'{lecture_slug}_part{part_id}'