class BPerms:
    pass


class DManage(BPerms):
    pass


class DRead(BPerms):
    pass


class SMCPerms:
    dt = DManage
    dr = DRead

    @classmethod
    def get_perms_names(cls):
        perms_names = [attr_name for attr_name, attr_type in cls.__dict__.items() if isinstance(attr_type, type)]
        # for attr_name, attr_type in cls.__dict__.items():
        #     if isinstance(attr_type, type):
        #         perms_names.append(attr_name)
        return perms_names


print(SMCPerms.get_perms_names())