space invaders. wndow not responding

#space invaders -part 1
#Set up the screen
#python 2.7
import turtle
import os
# set up screen
wn = turtle.Screen()
wn.bgcolor("black")
wn.title("deadly hallows")

#Draw border
border_pen = turtle.Turtle()
border_pen.speed(0)
border_pen.color("white")
border_pen.penup()
border_pen.setposition (-300,-300)
border_pen.pendown()
border_pen.pensize(3)
for side in range(4):
    border_pen.fd(600)
    border_pen.lt(90)
    border_pen.hideturtle()

#player turtle
player = turtle.Turtle()
player.color("blue")
player.shape("triangle")
player.penup()
player.speed(0)
player.setposition(0, -250)

Playerspeed = 15
# Move the player left and right
def move_left():
        x = player.xcor()
        x -= playerspeed
        player.setx(x)
        def move_right():
            x=player.xcor()
            x += playerspeed
            player.setx(x)


#keybord bindings
turtle.listen()
turtle.onkey(move_left, "left")
turtle.onkey(move_right, "right")






delay = raw_input("press enter to finish.")