Riempimento Python

import turtle
turtle.penup()
turtle.goto(20,30)
turtle.pendown()
turtle.pencolor(30,200,10)
turtle.fillcolor("green")
turtle.begin_fill()
turtle.forward(100)
turtle.right(90)
turtle.pencolor(130,20,100)
turtle.forward(100)
turtle.right(90)
turtle.pencolor(130,130,130)
turtle.forward(100)
turtle.right(90)
turtle.pencolor(0,0,0)
turtle.forward(100)
turtle.end_fill()