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from dataclasses import dataclass, field, KW_ONLY from typing import ClassVar @dataclass(frozen=True, slots=True) class Point: x: float; y: float _registry: ClassVar[list] = [] def distance(self) -> float: return (self.x**2 + self.y**2) ** 0.5 @dataclass class Circle: center: Point radius: float = field(default=1.0, metadata={"unit": "metres"}) _: KW_ONLY color: str = "black" p = Point(3.0, 4.0) print(p.distance()) # 5.0
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