One thing I noticed immediately is that the code where you're printing the message is not in your _draw() function. Since _draw() is clearing the screen and drawing other stuff every frame, even if your print is working, it'll be overwritten by the stuff happening in _draw(), so you'd never see it. When I move that print statement into _draw(), the code works fine - I see the message up until h gets to be 23, at which point it doesn't print.

Ok thank you