code: def aggregate(self, instance, owner):
          
  
          try:
              p = self.pangler_factory.from_store(instance, self.id)
          except KeyError:
              pass
          else:
              return p
          p = self.pangler_factory(self.id)
          mro = inspect.getmro(owner)
          others = []
          for cls in mro:
              sub_p = getattr(cls, self.attr_name, None)
              if sub_p is None:
                  continue
              others.append(sub_p)
          return p.combine(*others).stored_bind(instance)
docs: Given an instance and a class, aggregate together some panglers.
  
          Walks every class in the MRO of the `owner` class, including `owner`,
          collecting panglers exposed as `self.attr_name`. The resulting pangler
          will be bound to the provided `instance`.