试写出你所能想到的所有形状（包括二维的和三维的），生成一个形状层次类体系。生成的类体系以Shape作为基类，并由此派生出TwoDimShape类和 ThreeDimShape类。它们的派生类是不同的形状类。定义类体系中的每个类，并用main函数进行测试。

以下是我编写的代码：

class Shape:
    def __init__(self):
        pass

    def get_area(self):
        pass

    def get_volume(self):
        pass


class TwoDimShape(Shape):
    def __init__(self):
        super().__init__()

    def get_area(self):
        pass


class ThreeDimShape(Shape):
    def __init__(self):
        super().__init__()

    def get_area(self):
        pass

    def get_volume(self):
        pass


class Circle(TwoDimShape):
    def __init__(self, radius):
        super().__init__()
        self.radius = radius

    def get_area(self):
        return 3.14 * self.radius * self.radius


class Square(TwoDimShape):
    def __init__(self, side):
        super().__init__()
        self.side = side

    def get_area(self):
        return self.side ** 2


class Triangle(TwoDimShape):
    def __init__(self, base, height):
        super().__init__()
        self.base = base
        self.height = height

    def get_area(self):
        return 0.5 * self.base * self.height


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

    def get_area(self):
        return 4 * 3.14 * self.radius * self.radius

    def get_volume(self):
        return 4 / 3 * 3.14 * self.radius ** 3


class Cube(ThreeDimShape):
    def __init__(self, side):
        super().__init__()
        self.side = side

    def get_area(self):
        return 6 * self.side ** 2

    def get_volume(self):
        return self.side ** 3


class Cylinder(ThreeDimShape):
    def __init__(self, radius, height):
        super().__init__()
        self.radius = radius
        self.height = height

    def get_area(self):
        return 2 * 3.14 * self.radius * self.height + 2 * 3.14 * self.radius ** 2

    def get_volume(self):
        return 3.14 * self.radius ** 2 * self.height


if __name__ == "__main__":
    circle = Circle(5)
    print(f"Circle area: {circle.get_area()}")

    square = Square(7)
    print(f"Square area: {square.get_area()}")

    triangle = Triangle(3, 4)
    print(f"Triangle area: {triangle.get_area()}")

    sphere = Sphere(5)
    print(f"Sphere area: {sphere.get_area()}, volume: {sphere.get_volume()}")

    cube = Cube(7)
    print(f"Cube area: {cube.get_area()}, volume: {cube.get_volume()}")

    cylinder = Cylinder(3, 5)
    print(f"Cylinder area: {cylinder.get_area()}, volume: {cylinder.get_volume()}")

在这个类层次结构中，Shape是基类，TwoDimShape和ThreeDimShape是直接从Shape派生出来的子类。然后，我们派生了不同的形状类（例如，Circle、Square、Triangle、Sphere、Cube和Cylinder），它们分别继承了TwoDimShape和ThreeDimShape类，并实现了它们各自的get_area()和get_volume()方法。在main函数中，我们创建了这些形状的对象，并测试它们各自的方法。