base.py 文件源码

def _registered(self, cls):
        if inspect.isclass(cls) and issubclass(cls, self._registerable_class):
            found = self._registry.get(cls, None)
            if found:
                return found
        else:
            # Allow for fetching by slugs as well.
            for registered in self._registry.values():
                if registered.slug == cls:
                    return registered
        class_name = self._registerable_class.__name__
        if hasattr(self, "_registered_with"):
            parent = self._registered_with._registerable_class.__name__
            raise NotRegistered('%(type)s with slug "%(slug)s" is not '
                                'registered with %(parent)s "%(name)s".'
                                % {"type": class_name,
                                   "slug": cls,
                                   "parent": parent,
                                   "name": self.slug})
        else:
            slug = getattr(cls, "slug", cls)
            raise NotRegistered('%(type)s with slug "%(slug)s" is not '
                                'registered.' % {"type": class_name,
                                                 "slug": slug})