title: I am using Turtle and when I open a window with Turtle, it does not respond
body: <p>I am using Turtle and when I open a window with Turtle, it does not respond. I haven't finished the code yet. I am still a beginner and I am trying to make a simple pong game. Thanks!</p>
  
  <pre><code>import turtle
  
  # Paddles
  pa = turtle.Turtle()
  pa.speed(0)
  pa.shape("square")
  pa.color("white")
  pa.penup()
  pa.goto(-350, 0)
  pa.shapesize(stretch_wid=5, stretch_len=1)
  
  pb = turtle.Turtle()
  pb.speed(0)
  pb.shape("square")
  pb.color("white")
  pb.penup()
  pb.goto(350, 0)
  pb.shapesize(stretch_wid=5, stretch_len=1)
  
  # ball
  ball = turtle.Turtle()
  ball.speed(0)
  ball.shape("circle")
  ball.color("white")
  ball.penup()
  ball.goto(0, 0)
  # Screen
  win = turtle.Screen()
  win.title("Stankity Stank Stank Stank")
  win.bgcolor("black")
  win.setup(width=800, height=600)
  win.tracer(0)
  while True:
      win.update
  
  # Controls
  def paup():
      y = pa.ycor()
      y += 20
      pa.sety(y)
  
  win.listen()
  win.onkeypress(paup, "w")
  </code></pre>
  
  <p>Stack Overflow said my post was mostly code, so here's some extra text.</p>