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Re: how to avoid checking the same condition repeatedly ?

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On Mon, Oct 28, 2013 at 10:14 PM, Steven D'Aprano
<steve+comp.lang.python@pearwood.info> wrote:
> if needs_preprocessing:
>     for elem in iterable:
>         # If you change this block, you must remember to change the
>         # block below too!
>         preprocess(item)
>         do_this(item)
>         do_that(item)
>         do_something_else(item, arg1, arg2, expression)
>         do_another_thing(item + arg3, key=whatever)
>         print(item)
> else:
>     for elem in iterable:
>         # If you change this block, you must remember to change the
>         # block above too!
>         preprocess(item)
>         do_this(item)
>         do_that(item)
>         do_something_else(item, arg1, arg2, expression)
>         do_another_thing(item, key=whatever)
>         print(item)
>
>
> The careful reader will notice that there's already a bug in this.

For a start, you're preprocessing in the second block... I don't think
that was your intentional bug :)

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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