Is this factory method implementation bad?

Question

Python

Is this factory method implementation bad? Why? And how can it be better?

def inheritors(cls: Class) -> List[Class]:
    """Get all class inheritors
    Returns:
        List[Class]: return all subclasses
    """
    subclasses = []
    work = [cls]
    while work:
        parent = work.pop()
        for child in parent.__subclasses__():
            if child not in subclasses:
                subclasses.append(child)
                work.append(child)
    return subclasses

class NodeForm(ABC):
    CONTENT_TYPE = None

    # некоторые поля и методы
    @abstractmethod
    def some_operation(self) -> str:
        pass

    @classmethod
    def get_all_subforms(cls) -> Dict[str, object]:
        out = dict()
        for child_cls in inheritors(cls):
            try:
                out[child_cls.CONTENT_TYPE] = child_cls
            except Exception:
                pass
        return out

class TextNodeForm(NodeForm):
    CONTENT_TYPE = "text"

    def some_operation(self):
        return "TextNodeForm"

class VideoNodeForm(NodeForm):
    CONTENT_TYPE = "video"

    def some_operation(self):
        return "TextNodeForm"

def NodeFormFactory(content_type: str) -> NodeForm:
    return NodeForm.get_all_subforms()[content_type]