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[Python-ideas] RFC: Multiple Dispatch

Łukasz Langa lukasz at langa.pl
Fri Aug 15 20:25:35 CEST 2014 
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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