code: def save(self):
          
          d = self._to_dict()
          if len(d.get('videoIds', [])) > 0:
              if not self.id:
                  self.id = self.connection.post('create_playlist', playlist=d)
              else:
                  data = self.connection.post('update_playlist', playlist=d)
                  if data:
                      self._load(data)
docs: Create or update a playlist.