change color turtle python code example

Example 1: how to change background color in python turtle

import turtle
wn=turtle.Screen()
wn.bgcolor("black")
wn.title("This is my screen title!")

Example 2: turtle python

from turtle import *
color('red', 'yellow')
begin_fill()
while True:
    forward(200)
    left(170)
    if abs(pos()) < 1:
        break
end_fill()
done()