I'm following a tutorial from codeacademy: https://www.youtube.com/watch?v=XGf2GcyHPhc

When I hit the play button to run in Pythonista nothing happens, in the tutorial the black screen for the "pong" game appears

can anyone help?

my code is:

import turtle

wn = turtle.Screen()
wn.title("pong by zach")
wn.bgcolor("black")
wn.setup(width=800,height=600)
wn.tracer(0)

main game loop

while True:
wn.update()