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Re: how to avoid checking the same condition repeatedly ?

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On Tue, Oct 29, 2013 at 5:14 PM, Peter Cacioppi
<peter.cacioppi@gmail.com> wrote:
> Nobody (yes, his name is Nobody) said:
>
> "If you're sufficiently concerned about performance that you're willing to
> trade clarity for it, you shouldn't be using Python in the first place."
>
> I don't think it's correct to imply that people very concerned about performance should not use Python. (And I agree, Nobody implied that ;)

No, I don't think he implied that. You can care about performance
while still putting code clarity as a higher priority :) If you
actually profile and find that something-or-other is a bottleneck,
chances are you can break it out into a function with minimal loss of
clarity, and then reimplement that function in C (maybe wielding
Cython for the main work). That doesn't compromise clarity.
Duplicating a loop to hoist a condition _does_. Of course, in C, you
can let the compiler do it for you, but Python can't be sure that it's
as constant as you think, so it can't be changed.

ChrisA

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Thread

how to avoid checking the same condition repeatedly ? Wolfgang Maier <wolfgang.maier@biologie.uni-freiburg.de> - 2013-10-28 09:50 +0000
  Re: how to avoid checking the same condition repeatedly ? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-10-28 11:14 +0000
    Re: how to avoid checking the same condition repeatedly ? Chris Angelico <rosuav@gmail.com> - 2013-10-28 22:18 +1100
      Re: how to avoid checking the same condition repeatedly ? Steven D'Aprano <steve@pearwood.info> - 2013-10-29 04:51 +0000
  Re: how to avoid checking the same condition repeatedly ? Piet van Oostrum <piet@vanoostrum.org> - 2013-10-28 14:31 -0400
  Re: how to avoid checking the same condition repeatedly ? Nobody <nobody@nowhere.com> - 2013-10-28 19:37 +0000
    Re: how to avoid checking the same condition repeatedly ? Neil Cerutti <neilc@norwich.edu> - 2013-10-29 13:44 +0000
      Re: how to avoid checking the same condition repeatedly ? rusi <rustompmody@gmail.com> - 2013-10-29 09:13 -0700
  Re: how to avoid checking the same condition repeatedly ? Peter Cacioppi <peter.cacioppi@gmail.com> - 2013-10-28 23:14 -0700
    Re: how to avoid checking the same condition repeatedly ? Chris Angelico <rosuav@gmail.com> - 2013-10-29 17:39 +1100
  Re: how to avoid checking the same condition repeatedly ? Peter Cacioppi <peter.cacioppi@gmail.com> - 2013-10-28 23:53 -0700
    Re: how to avoid checking the same condition repeatedly ? Chris Angelico <rosuav@gmail.com> - 2013-10-29 18:09 +1100
  Re: how to avoid checking the same condition repeatedly ? Peter Cacioppi <peter.cacioppi@gmail.com> - 2013-10-29 16:55 -0700
  Re: how to avoid checking the same condition repeatedly ? alex23 <wuwei23@gmail.com> - 2013-10-30 11:38 +1000
  Re: how to avoid checking the same condition repeatedly ? Mariano Anaya <marianoanaya@gmail.com> - 2013-10-30 06:34 -0700

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