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Groups > comp.lang.python > #82424

Re: Extension of while syntax

From Marko Rauhamaa <marko@pacujo.net>
Newsgroups comp.lang.python
Subject Re: Extension of while syntax
Date 2014-12-12 10:25 +0200
Organization A noiseless patient Spider
Message-ID <87iohh5l6c.fsf@elektro.pacujo.net> (permalink)
References <14d2b880-3837-4267-a769-33ae7393f78b@googlegroups.com> <mailman.16886.1418351925.18130.python-list@python.org> <87r3w5gx7s.fsf@elektro.pacujo.net> <mailman.16895.1418369925.18130.python-list@python.org>

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Chris Angelico <rosuav@gmail.com>:

> On Fri, Dec 12, 2014 at 6:10 PM, Marko Rauhamaa <marko@pacujo.net> wrote:
>> Chris Angelico <rosuav@gmail.com>:
>>
>>> You could deduplicate it by shifting the condition:
>>>
>>> while True:
>>>     value = get_some_value()
>>>     if value not in undesired_values: break
>>>
>>> But I'm not sure how common this idiom actually is.
>>
>> Extremely common, and not only in Python.
>
> Something like it is certainly common, but to justify dedicated
> syntax, the pure form has to be so amazingly common as to merit it.

You already showed the perfect dedicated syntax.

The variations of the while-True-...-break idiom are limitless. There's
little need to "optimize" it further.


Marko

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Thread

Extension of while syntax Nelson Crosby <nc@sourcecomb.com> - 2014-12-11 18:21 -0800
  Re: Extension of while syntax Ben Finney <ben+python@benfinney.id.au> - 2014-12-12 13:37 +1100
  Re: Extension of while syntax Chris Angelico <rosuav@gmail.com> - 2014-12-12 13:38 +1100
    Re: Extension of while syntax Marko Rauhamaa <marko@pacujo.net> - 2014-12-12 09:10 +0200
      Re: Extension of while syntax Chris Angelico <rosuav@gmail.com> - 2014-12-12 18:38 +1100
        Re: Extension of while syntax Marko Rauhamaa <marko@pacujo.net> - 2014-12-12 10:25 +0200
      Re: Extension of while syntax cl@isbd.net - 2014-12-12 09:09 +0000
        Re: Extension of while syntax Marko Rauhamaa <marko@pacujo.net> - 2014-12-12 12:33 +0200
  RE: Extension of while syntax "Clayton Kirkwood" <crk@godblessthe.us> - 2014-12-11 18:59 -0800
  Re: Extension of while syntax Terry Reedy <tjreedy@udel.edu> - 2014-12-11 22:00 -0500
  Re: Extension of while syntax Ben Finney <ben+python@benfinney.id.au> - 2014-12-12 14:14 +1100
  Re: Extension of while syntax Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-12-12 08:00 +0000
  Re: Extension of while syntax Chris Angelico <rosuav@gmail.com> - 2014-12-12 19:05 +1100
  Re: Extension of while syntax Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2014-12-12 11:38 -0500
  Re: Extension of while syntax Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-12-13 22:56 +1100

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