Weird Loop Behaviour
Emile van Sebille
emile at fenx.com
Fri Jan 20 16:20:21 EST 2012
On 1/20/2012 12:47 PM Yigit Turgut said...
> Hi,
>
> In the following code, I am trying to run "black" screen for 3 seconds
> and respectively 2 seconds "white" screen. Black routine takes 3
> seconds and white 2 seconds, 2 x black + white = 8 seconds which
> should be the expected value but when I run it I get black-white-black-
> white instead of black-white-black. Couldn't figure out what is
> wrong thus sharing the code as well ;
>
> white = False
> while(end<8.00):
> end = time.time() - start
you're setting end's value before the display happens, so while tests
the values 0,3,5 before getting after the fourth pass 8. Move this
after to white = note white and I suspect you'll be OK.
HTH,
Emile
> if white:
> screen.fill((255, 255, 255))
> time.sleep(2)
> else:
> screen.fill((0, 0, 0))
> time.sleep(3)
> white = not white
> pygame.display.update()
> pygame.quit()
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