import turtle

wn = turtle.Screen()
wn.title("Ping Pong Game by @justmalhar")
wn.bgcolor("black")
wn.setup(width=800,height=600)
wn.tracer(0)

paddle_a = turtle.Turtle()
paddle_a.speed(0)
paddle_a.shape("square")
paddle_a.color("white")
paddle_a.shapesize(stretch_wid=5, stretch_len=1)
paddle_a.penup()
paddle_a.goto(-350,0)

paddle_b= turtle.Turtle()
paddle_b.speed(0)
paddle_b.shape("square")
paddle_b.color("white")
paddle_b.shapesize(stretch_wid=5, stretch_len=1)
paddle_b.penup()
paddle_b.goto(350,0)

ball= turtle.Turtle()
ball.speed(0)
ball.shape("square")
ball.color("white")
ball.penup()
ball.goto(0,0)

def paddle_a_up():
    y = paddle_a.ycor()
    y += 20
    paddle_a.sety(y)

def paddle_a_down():
    y = paddle_a.ycor()
    y -= 20
    paddle_a.sety(y)

def paddle_b_up():
    y = paddle_a.ycor()
    y += 20
    paddle_b.sety(y)

def paddle_b_down():
    y = paddle_a.ycor()
    y -= 20
    paddle_b.sety(y)

wn.listen()
wn.onkey(paddle_a_up, "w")
wn.onkey(paddle_a_down,"s")
wn.onkey(paddle_b_up, "Up")
wn.onkey(paddle_b_down,"Down")

while True:
    wn.update()