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Re: Interface and duck typing woes

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On 31 August 2013 01:13, Steven D'Aprano
<steve+comp.lang.python@pearwood.info> wrote:
> On Fri, 30 Aug 2013 06:35:47 -0400, Roy Smith wrote:
>
>> In article <52200699$0$6599$c3e8da3$5496439d@news.astraweb.com>,
>>  Steven D'Aprano <steve+comp.lang.python@pearwood.info> wrote:
>>
>>> These days, it would be relatively simple to implement pre- and post-
>>> condition checking using decorators, and indeed one of the motivating
>>> use- cases for function annotations in Python 3 is to allow such
>>> things.
>>>
>>> http://www.python.org/dev/peps/pep-3107/
>>>
>>> (Function annotations are perhaps the best Python feature that nobody
>>> uses.)
>>
>> This is awesome.
>
> Heh, everybody has one of two reactions:
>
> "This is awesome!"
>
> "You'll add type checking to my Python code over my dead body!!!"
>
> But I'm still to see a practical use for annotations in real world code.
> Or indeed to think of a use for them other than type checking.

I occasionally use them for documentation. I think that there some are
cases where the return type (encoded as a string) is as good an indicator
of functionality as a short docstring, so use both.

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Interface and duck typing woes Joe Junior <joe.fbs.junior@gmail.com> - 2013-08-28 18:09 -0300
  Re: Interface and duck typing woes Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-08-28 23:24 +0000
  Re: Interface and duck typing woes Nobody <nobody@nowhere.com> - 2013-08-29 10:41 +0100
    Re: Interface and duck typing woes Joe Junior <joe.fbs.junior@gmail.com> - 2013-08-29 09:40 -0300
      Re: Interface and duck typing woes alex23 <wuwei23@gmail.com> - 2013-08-30 10:14 +1000
      Re: Interface and duck typing woes Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-08-30 02:42 +0000
        Re: Interface and duck typing woes Roy Smith <roy@panix.com> - 2013-08-30 06:35 -0400
          Re: Interface and duck typing woes Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-08-31 00:13 +0000
            Re: Interface and duck typing woes Ned Batchelder <ned@nedbatchelder.com> - 2013-08-30 20:45 -0400
            Re: Interface and duck typing woes Joshua Landau <joshua@landau.ws> - 2013-09-01 00:18 +0100
            Re: Interface and duck typing woes Roy Smith <roy@panix.com> - 2013-08-31 20:52 -0400
    Re: Interface and duck typing woes Chris Angelico <rosuav@gmail.com> - 2013-08-29 23:07 +1000
    Re: Interface and duck typing woes Joe Junior <joe.fbs.junior@gmail.com> - 2013-08-29 11:11 -0300
  Re: Interface and duck typing woes jussi.santti@ard.fi - 2013-08-29 22:37 -0700

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