How to create add a background, create a player sprite, and add game controller functionality in Python using Turtle Graphics

turtleInSpace.py

# This code was written by the team at www.trinket.io for use in their trinket.io 
# web based integrated python development environment. The game may need some
# modification to work using the standard Python 2.7 distribution. This code
# has been posted here to my personal github profile for reference purposes 
# related to my teaching duties at theCoderSchool in Flower Mound, TX. 
# This code is from the public domain, is free to use and modify, and does
# not require a software license of any kind.

# Click in the righthand window to make it active then use your arrow
# keys to control the spaceship!
import turtle

screen = turtle.Screen()

# this assures that the size of the screen will always be 400x400 ...
screen.setup(400, 400)
#screen.setup(800, 800)

# ... which is the same size as our image
# now set the background to our space image
screen.bgpic("space.jpg")
screen.bgpic("")

# Or, set the shape of a turtle
screen.addshape("rocketship.png")
turtle.shape("rocketship.png")

move_speed = 10
turn_speed = 10

# these defs control the movement of our "turtle"
def forward():
  turtle.forward(move_speed)

def backward():
  turtle.backward(move_speed)

def left():
  turtle.left(turn_speed)

def right():
  turtle.right(turn_speed)

turtle.penup()
turtle.speed(0)
turtle.home()

# now associate the defs from above with certain keyboard events
screen.onkey(forward, "Up")
screen.onkey(backward, "Down")
screen.onkey(left, "Left")
screen.onkey(right, "Right")
screen.listen()