定义一个Shap基类，并派生出圆球体和立方体类，在主函数中分别求圆球体与立方体对象的表面积和体积。

好的，我明白了。以下是代码实现：

import math

class Shape:
    def surface_area(self):
        pass
    
    def volume(self):
        pass

class Sphere(Shape):
    def __init__(self, radius):
        self.radius = radius
    
    def surface_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, side_length):
        self.side_length = side_length
    
    def surface_area(self):
        return 6 * (self.side_length ** 2)
    
    def volume(self):
        return self.side_length ** 3

# 主函数
def main():
    sphere = Sphere(5)
    print("Sphere surface area:", sphere.surface_area())
    print("Sphere volume:", sphere.volume())

    cube = Cube(10)
    print("Cube surface area:", cube.surface_area())
    print("Cube volume:", cube.volume())

if __name__ == '__main__':
    main()

当你运行代码时，它会输出以下结果：

Sphere surface area: 314.1592653589793
Sphere volume: 523.5987755982989
Cube surface area: 600
Cube volume: 1000