#Space Invaders
#Set up the screen

import turtle
import os

#Screen
screen = turtle.Screen()
screen.bgcolor("black")
screen.title("Space Invaders 0.1")

#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()

#The Player
player = turtle.Turtle()
player.color("blue")
player.shape("triangle")
player.penup()
player.speed(0)
player.setposition(0, -250)
player.setheading(90)

playerspeed = 15

#Movement
def move_left():
    x = player.xcor()
    x -= playerspeed
    player.setx(x)

#KeyBoard binding
turtle.listen()
turtle.onkey(move_left, "Left")
















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