code: def attach_bp(self, bp, description=''):
          
  
          if not isinstance(bp, Blueprint):
              raise InvalidBlueprint('Blueprints attached to the bundle must be of type {0}'.format(Blueprint))
  
          self.blueprints.append((bp, description))
docs: Attaches a flask.Blueprint to the bundle
  
          :param bp: :class:`flask.Blueprint` object
          :param description: Optional description string
          :raises:
              - InvalidBlueprint if the Blueprint is not of type `flask.Blueprint`