[Python-ideas] RFC: Multiple Dispatch

[Łukasz Langa]

Ah, that’s right, I meant singledispatch. Sorry for the confusion! :)

-- 
Best regards,
Łukasz Langa

WWW: http://lukasz.langa.pl/
Twitter: @llanga
IRC: ambv on #python-dev

On Aug 15, 2014, at 11:33 AM, Matthew Rocklin <mrocklin at gmail.com> wrote:

> I assume that Lukasz is referrring to singledispatch?  multipledispatch doesn't yet have that level of adoption as far as I'm aware.
> 
> 
> On Fri, Aug 15, 2014 at 11:25 AM, Łukasz Langa <lukasz at langa.pl> wrote:
> It has over 25k downloads from PyPI per month. It’s used in OpenStack’s Nova. It’s used at Facebook as part of a deadline based, resource aware, dependency based, fault tolerant scheduler.
> 
> -- 
> Best regards,
> Łukasz Langa
> 
> WWW: http://lukasz.langa.pl/
> Twitter: @llanga
> IRC: ambv on #python-dev
> 
> 
> 
> On Aug 15, 2014, at 11:01 AM, Guido van Rossum <guido at python.org> wrote:
> 
>> Please do write about non-toy examples!
>> 
>> 
>> On Fri, Aug 15, 2014 at 10:55 AM, Matthew Rocklin <mrocklin at gmail.com> wrote:
>> I've definitely seen homegrown solutions like Alexander talks about in a variety of projects.  It has popped up a few times in SymPy.  
>> 
>> My implementation was influenced somewhat by Julia's solution which seems fairly sober.  Multiple dispatch has demonstrated value in that community.
>> 
>> I used the multipledispatch library in a few of my projects.  I can provide examples of where it's been helpful if desired.
>> 
>> 
>> On Fri, Aug 15, 2014 at 10:47 AM, Alexander Belopolsky <alexander.belopolsky at gmail.com> wrote:
>> 
>> On Fri, Aug 15, 2014 at 1:28 PM, Guido van Rossum <guido at python.org> wrote:
>> Are there good uses of singledispatch in the wild even?
>> 
>> In one of my projects, I have a todo item to convert a homegrown {type:func} dictionary based dispatch to singledispatch.  It has been open for 5 months already.  I wouldn't be surprised if others had something similar: a good-enough (and probably buggy) solution that is not bad enough to justify adding extra dependency in 2.x or replacing with a 3.x only solution.
>> 
>> Multiple dispatch is much harder to get right or even "good enough," so I don't think singledispatch popularity or lack thereof is a good predictor for multipledispatch.
>> 
>> 
>> 
>> 
>> -- 
>> --Guido van Rossum (python.org/~guido)
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