code: def _to_dict(self):
          ''' Returns a dictionary representation of this object '''
          return dict(minimum=self.minimum._to_dict(),
                      maximum=self.maximum._to_dict()f _to_dict(self):
          ''' Returns a dictionary representation of this object '''
          return dict(minimum=self.minimum._to_dict(),
                      maximum=self.maximum._to_dict())
docs: Returns a dictionary representation of this object