Using msvcrt (in Windows), how to catch Enter key?

Dick Moores rdm at rcblue.com
Tue Oct 30 05:46:19 CET 2007


At 06:34 PM 10/29/2007, Gabriel Genellina wrote:
>En Mon, 29 Oct 2007 21:22:36 -0300, Dick Moores <rdm at rcblue.com> escribió:
>
> > At 03:23 PM 10/29/2007, Gabriel Genellina wrote:
> >> En Mon, 29 Oct 2007 14:39:49 -0300, Dick Moores <rdm at rcblue.com>
> >> escribió:
> >>
> >>
> >> At least add a small sleep() call inside the loop, to be nice to other
> >> running processes:
> >>
> >
> > Yes, that makes a major difference in the CPU
> > usage percentage on my computer. In fact I can't
> > even tell that there is anything going on other
> > than the usual behind-the-scenes XP stuff. CPU
> > usage stays right around 0% or 6%, with an
> > occasional 6% and a very occasional 15%.
> > Interestingly, sleep(0.001) makes as big a
> > difference as your sleep(0.1), but sleep(0.0001) bumps it up to a steady
> > 100%!
>
>The underlying function in Windows is Sleep (or SleepEx) which takes an
>argument in milliseconds. 0.0001s = 0.1ms and it's rounded to 0. Sleep(0)
>has very specific semantics - for a single threaded program, it does
>nothing, so your code is effectively a busy loop taking 100% CPU.

Ah, useful information. Thank you. Where'd you learn that?

Dick Moores





More information about the Python-list mailing list