class Circle: def__init__(self, radius): self.radius= radius
class Rectangle: def__init__(self, width, height): self.width= width self.height= height
def match_shape(shape):
match shape:
case Circle(radius=1): print("匹配到半径为1的圆")
case Rectangle(width=1, height=2): print("匹配到宽度为1,高度为2的矩形")
case _: print("匹配到其他形状")