code: def save(self):
          
          # Possibly save the tags to ID3v2.3.
          kwargs = {}
          if self.id3v23:
              id3 = self.mgfile
              if hasattr(id3, 'tags'):
                  # In case this is an MP3 object, not an ID3 object.
                  id3 = id3.tags
              id3.update_to_v23()
              kwargs['v2_version'] = 3
  
          mutagen_call('save', self.path, self.mgfile.save, **kwargs)
docs: Write the object's tags back to the file. May
          throw `UnreadableFileError`.