code: def _get_attrs(self, names):
          
          assert isinstance(names, str)
          names = names.replace(",", " ").split(" ")
          res = []
          for n in names:
              if n == "":
                  continue
              if n not in self.__dict__:
                  raise KeyError("Unknown name for Container attribute: '{}'".format(n))
              res.append(getattr(self, n))
          return res
docs: Convenience function to extract multiple attributes at once
  
          :param names:   string of names separated by comma or space
          :return: