定义一个Shape基类，并派生出圆球体（Shape)和立方体类（Cube),分别求圆球体与立方体对象的表面积和体积

可以参考如下代码实现：

import math

class Shape:
    def area(self):
        pass

    def volume(self):
        pass

class Sphere(Shape):
    def __init__(self, radius):
        self.radius = radius

    def area(self):
        return 4 * math.pi * self.radius ** 2

    def volume(self):
        return 4 / 3 * math.pi * self.radius ** 3

class Cube(Shape):
    def __init__(self, edge_length):
        self.edge_length = edge_length

    def area(self):
        return 6 * self.edge_length ** 2

    def volume(self):
        return self.edge_length ** 3

# 示例用法
sphere = Sphere(3)
cube = Cube(4)

print("Sphere area:", sphere.area())
print("Sphere volume:", sphere.volume())
print("Cube area:", cube.area())
print("Cube volume:", cube.volume())

输出结果为：

Sphere area: 113.09733552923254
Sphere volume: 113.09733552923254
Cube area: 96
Cube volume: 64