3D Turtles

from turtle import *
import random

def cube(cam, box):
    box[2] = box[2] / 20
    width = 300.0 #dimensions of the "screen"
    height = 300.0
    vertices = []
    vertices.append([0.0, 0.0, 0.0]) #every vertex.
    vertices.append([0.0, 0.0, 1.0 * box[2]])
    vertices.append([0.0, 1.0 * box[1], 0.0])
    vertices.append([0.0, 1.0 * box[1], 1.0 * box[2]])
    vertices.append([1.0 * box[0], 0.0, 0.0])
    vertices.append([1.0 * box[0], 0.0, 1.0 * box[2]])
    vertices.append([1.0 * box[0], 1.0 * box[1], 0.0])
    vertices.append([1.0 * box[0], 1.0 * box[1], 1.0 * box[2]])
    newverts = []
    for i in range(len(vertices)):
        vert = vertices[i]
        z = vert[2] + 1
        F = z - cam[2]
        """if (z == 0):
            z = 1 #uuuuuhh"""
        x = ((vert[0] - cam[0]) * (F / z)) + cam[0] + 1
        y = ((vert[1] - cam[1]) * (F / z)) + cam[1] + 1
        newverts.append([x, y])
    """for i in range(len(newverts)):
        #pu()
        goto(newverts[i])
        #pd()
        #dot(3)
        "=""rt(90)
        fd(20)
        rt(-90)
        fd(20)"=""
        print(i, newverts[i])"""
    pu()
    goto(newverts[0]) #manuel labor
    pd()
    #goto(newverts[])
    goto(newverts[4])
    goto(newverts[6])
    goto(newverts[2])
    goto(newverts[0])
    pu()
    goto(newverts[1])
    pd()
    goto(newverts[3])
    goto(newverts[7])
    goto(newverts[5])
    goto(newverts[1])
    goto(newverts[0])
    pu()
    goto(newverts[5])
    pd()
    goto(newverts[4])
    pu()
    goto(newverts[3])
    pd()
    goto(newverts[2])
    pu()
    goto(newverts[7])
    pd()
    goto(newverts[6])

#main
speed(0)

camera = [-5, -5, 10] #x,y,z

def keydown_d():
    key_d = true
    camera[0] = camera[0] + 1

def keydown_a():
    key_a = true
    camera[0] = camera[0] - 1

def keydown_w():
    key_w = true
    camera[2] = camera[2] + .5

def keydown_s():
    key_s = true
    camera[2] = camera[2] - .5

while (True):
    key_d = false
    key_a = false
    key_w = false
    key_s = false
    listen()
    onkey(keydown_d, "d")
    onkey(keydown_a, "a")
    onkey(keydown_w, "w")
    onkey(keydown_s, "s")
    boxinfo = [10.0, 10.0, 10.0] #width, height, depth; does not really make a cube
    cube(camera, boxinfo)
    clear()

done()