Figuras con turtle , pidiendo colores

Triangulo:

import turtle
import tkSimpleDialog
turtle.speed(100)
fonde = turtle.Screen()
b=tkSimpleDialog.askstring("hola","Dame el color")
c=tkSimpleDialog.askstring("hola","Dame el color del fondo")
a=tkSimpleDialog.askstring("hola","Dame el color del relleno")
fonde.bgcolor(c)
turtle.pencolor(b)
turtle.fillcolor(a)
turtle.begin_fill()
for x in range (3):
    turtle.forward(100)
    turtle.left(120)

turtle.end_fill()

turtle.exitonclick()

Cuadrado:

import turtle
import tkSimpleDialog
turtle.speed(100)
fonde = turtle.Screen()
b=tkSimpleDialog.askstring("hola","Dame el color")
c=tkSimpleDialog.askstring("hola","Dame el color del fondo")
a=tkSimpleDialog.askstring("hola","Dame el color del relleno")
fonde.bgcolor(c)
turtle.pencolor(b)
turtle.fillcolor(a)
turtle.begin_fill()
for x in range (4):
    turtle.forward(100)
    turtle.left(90)

turtle.end_fill()

turtle.exitonclick() 

octagono:

import turtle
import tkSimpleDialog
turtle.speed(100)
fonde = turtle.Screen()
b=tkSimpleDialog.askstring("hola","Dame el color")
c=tkSimpleDialog.askstring("hola","Dame el color del fondo")
a=tkSimpleDialog.askstring("hola","Dame el color del relleno")
fonde.bgcolor(c)
turtle.pencolor(b)
turtle.fillcolor(a)
turtle.begin_fill()
for x in range (8):
    turtle.forward(100)
    turtle.left(45)

turtle.end_fill()

turtle.exitonclick()