if invalid_bitrates := set(requested_bitrates) - self._VALID_BITRATES:
raise ValueError(
f'Invalid bitrate(s): {", ".join(invalid_bitrates)}. '
- + f'Valid bitrates are: {", ".join(sorted(self._VALID_BITRATES, key=int))}')
+ f'Valid bitrates are: {", ".join(sorted(self._VALID_BITRATES, key=int))}')
return requested_bitrates
def _extract_formats(self, song_data):