class Round: def init(self, r, pi): self.r = r self.pi = pi

def get_perimeter(self):
    return 2 * self.pi * self.r
    
def get_area(self):
    return self.pi * self.r ** 2

r1 = Round(3, 3.14) # 创建一个半径为3，圆周率为3.14的圆对象 print("圆的周长为：", r1.get_perimeter()) print("圆的面积为：", r1.get_area())

计算矩形的周长和面积

length = 4 width = 5 perimeter = 2 * (length + width) area = length * width

print("矩形的周长为：", perimeter) print("矩形的面积为：", area)