编一个立方灯程序

这里给出一个Python实现的立方灯程序，使用了turtle库来绘制立方体。代码如下：

import turtle

def draw_cube(size):
    for i in range(4):
        turtle.forward(size)
        turtle.left(90)
    turtle.left(45)
    turtle.forward(size/2)
    turtle.right(135)
    turtle.forward(size)
    turtle.right(135)
    turtle.forward(size/2)
    turtle.left(45)
    turtle.backward(size/2)
    turtle.right(45)
    turtle.forward(size/2)
    turtle.right(45)
    turtle.forward(size)
    turtle.left(45)
    turtle.backward(size/2)
    turtle.right(45)
    turtle.backward(size/2)
    turtle.right(45)
    turtle.backward(size)
    turtle.left(45)
    turtle.forward(size/2)
    turtle.right(45)
    turtle.backward(size/2)
    turtle.right(45)
    turtle.backward(size)
    turtle.left(45)
    turtle.backward(size/2)
    turtle.right(45)
    turtle.backward(size/2)
    turtle.right(45)
    turtle.backward(size/2)
    
turtle.speed("fastest")
turtle.hideturtle()
turtle.color("red")
turtle.penup()
turtle.goto(0, 0)
turtle.pendown()
draw_cube(100)
turtle.done()

运行程序后，会在窗口中绘制一个红色的立方体。你可以尝试修改参数 `size` 来调整立方体的大小。