a short example with turtles

my_turtle.py

import turtle
 window = turtle.Screen()         # set up the window color and title
 window.bgcolor("black")
 window.title("an educational exercise")

 treeherder = turtle.Turtle()       # create a turtle
 treeherder.color("green")          # make him draw a green line
 treeherder.pensize(5)


 window.mainloop()