from turtle import *
from random import random

setup(800,600)
penup()
goto(-200,0)
pendown()
for x in range (1,21):
    rgb=tuple(random() for i in range(3))
    color(rgb)
    begin_fill()
    fd(20)
    left(90)
    fd(20)
    left(90)
    fd(20)
    left(90)
    fd(20)
    left(90)
    fd(20)
    end_fill()

hideturtle()
done()