Re: [Possible SPAM] Re: Using msvcrt (in Windows), how to catch Enter key?
En Mon, 29 Oct 2007 21:22:36 -0300, Dick Moores <[EMAIL PROTECTED]> escribió: > At 03:23 PM 10/29/2007, Gabriel Genellina wrote: >> En Mon, 29 Oct 2007 14:39:49 -0300, Dick Moores <[EMAIL PROTECTED]> >> 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. -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
Re: [Possible SPAM] Re: Using msvcrt (in Windows), how to catch Enter key?
At 03:23 PM 10/29/2007, Gabriel Genellina wrote: >En Mon, 29 Oct 2007 14:39:49 -0300, Dick Moores <[EMAIL PROTECTED]> escribió: > > > But here's a case where it seems I do need the > > > > if msvcrt.kbhit() line > >At least add a small sleep() call inside the loop, to be nice to other >running processes: > > > = > > #!/usr/bin/env python > > #coding=utf-8 > > import time > > import msvcrt > > timeNow = time.time() > > oldTimeNow = timeNow > > while True: > > if msvcrt.kbhit(): > > key = msvcrt.getch() > > if key == 'h': > > print 'Hello' > > if key == 'b': > > print 'Bye' > > if key == '\r': # Enter key > > break > else: > time.sleep(0.1) > > timeNow = time.time() > > if timeNow - oldTimeNow > 5: > > print "5 seconds passed" > > oldTimeNow = timeNow > > = 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%! Thanks, Dick -- http://mail.python.org/mailman/listinfo/python-list
