code: def get_owned_by(cls, username, api=None):
          
          api = api if api else cls._API
  
          return super(Dataset, cls)._query(
              url=cls._URL['owned_by'].format(username=username),
              fields='_all',
              api=api
          )
docs: Query ( List ) datasets by owner
          :param api: Api instance
          :param username: Owner username
          :return: Collection object