[Python-ideas] RFC: Multiple Dispatch

[Matthew Rocklin]

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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