code: def album_cover_url(self):
          
          large_image = self._assets.get('large_image', '')
          if large_image[:8] != 'spotify:':
              return ''
          album_image_id = large_image[8:]
          return 'https://i.scdn.co/image/' + album_image_id
docs: :class:`str`: The album cover image URL from Spotify's CDN.