class Room:
    __rooms = {}

    def __init__(self, name: str, description: str, **kwargs):
        self, self.name, self.description, Room.__rooms[name] = (Room.__rooms[name] if not kwargs else (lambda : (_ for _ in ()).throw(ValueError())) if name in Room.__rooms else self, name, description, self if not any([kwarg in self.__dict__ for kwarg in kwargs]) else (lambda : (_ for _ in ()).throw(ValueError))