Curve a NURBS curve degree instance-attribute degree: int periodic instance-attribute periodic: bool rational instance-attribute rational: bool points instance-attribute points: List[float] weights instance-attribute weights: List[float] knots instance-attribute knots: List[float] closed instance-attribute closed: bool displayValue instance-attribute displayValue: Polyline bbox class-attribute instance-attribute bbox: Optional[Box] = None length property writable length: float area property writable area: float