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devel / comp.lang.python / Re: Fallback for operator and other dunder methods

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* Re: Fallback for operator and other dunder methodsDom Grigonis
`* Re: Fallback for operator and other dunder methodsEdmondo Giovannozzi
 `- Re: Fallback for operator and other dunder methodsDom Grigonis

1
Re: Fallback for operator and other dunder methods

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Subject: Re: Fallback for operator and other dunder methods
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 by: Dom Grigonis - Wed, 26 Jul 2023 18:35 UTC

Tried exactly that and didn’t work. Neither __getattr__, nor __getattribute__ of meta is being invoked.

> On 26 Jul 2023, at 10:01, Chris Angelico via Python-list <python-list@python.org> wrote:
>
> On Wed, 26 Jul 2023 at 16:52, Dom Grigonis <dom.grigonis@gmail.com> wrote:
>>
>> Could you give an example? Something isn’t working for me.
>>
>
> This is a metaclass:
>
> class Meta(type):
> ...
> class Demo(metaclass=Meta):
> ...
>
> In order to catch those kinds of attribute lookups, you'll need the
> metaclass to hook them. And you might need to use __getattribute__
> rather than __getattr__. However, there may also be some checks that
> simply look for the presence of the attribute (see: slots), so you may
> find that it's even more complicated. It's usually easiest to just
> create the slots you want.
>
> ChrisA
> --
> https://mail.python.org/mailman/listinfo/python-list

Re: Fallback for operator and other dunder methods

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Subject: Re: Fallback for operator and other dunder methods
From: edmondo.giovannozzi@gmail.com (Edmondo Giovannozzi)
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 by: Edmondo Giovannozzi - Wed, 2 Aug 2023 16:54 UTC

Il giorno mercoledì 26 luglio 2023 alle 20:35:53 UTC+2 Dom Grigonis ha scritto:
> Tried exactly that and didn’t work. Neither __getattr__, nor __getattribute__ of meta is being invoked.
> > On 26 Jul 2023, at 10:01, Chris Angelico via Python-list <pytho...@python.org> wrote:
> >
> > On Wed, 26 Jul 2023 at 16:52, Dom Grigonis <dom.gr...@gmail.com> wrote:
> >>
> >> Could you give an example? Something isn’t working for me.
> >>
> >
> > This is a metaclass:
> >
> > class Meta(type):
> > ...
> > class Demo(metaclass=Meta):
> > ...
> >
> > In order to catch those kinds of attribute lookups, you'll need the
> > metaclass to hook them. And you might need to use __getattribute__
> > rather than __getattr__. However, there may also be some checks that
> > simply look for the presence of the attribute (see: slots), so you may
> > find that it's even more complicated. It's usually easiest to just
> > create the slots you want.
> >
> > ChrisA
> > --
> > https://mail.python.org/mailman/listinfo/python-list

For numpy arrays you can find some suggestion at:
https://numpy.org/doc/stable/user/basics.dispatch.html

Re: Fallback for operator and other dunder methods

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Subject: Re: Fallback for operator and other dunder methods
Date: Fri, 4 Aug 2023 19:07:50 +0300
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 by: Dom Grigonis - Fri, 4 Aug 2023 16:07 UTC

The issue was more of a wrapping around numpy array. Found the solution already. Unfortunately, there is no equivalent to __getattr__, the only way is to dynamically define them from meta. It seems it’s pretty standard to just have a collection of special method names and using them for similar cases. Well, at least it’s what I got to. __getattr__ feels very hacky for such case, so maybe it’s for the best.

> On 2 Aug 2023, at 19:54, Edmondo Giovannozzi via Python-list <python-list@python.org> wrote:
>
> Il giorno mercoledì 26 luglio 2023 alle 20:35:53 UTC+2 Dom Grigonis ha scritto:
>> Tried exactly that and didn’t work. Neither __getattr__, nor __getattribute__ of meta is being invoked.
>>> On 26 Jul 2023, at 10:01, Chris Angelico via Python-list <pytho...@python.org <http://python.org/>> wrote:
>>>
>>> On Wed, 26 Jul 2023 at 16:52, Dom Grigonis <dom.gr <http://dom.gr/>...@gmail.com <http://gmail.com/>> wrote:
>>>>
>>>> Could you give an example? Something isn’t working for me.
>>>>
>>>
>>> This is a metaclass:
>>>
>>> class Meta(type):
>>> ...
>>> class Demo(metaclass=Meta):
>>> ...
>>>
>>> In order to catch those kinds of attribute lookups, you'll need the
>>> metaclass to hook them. And you might need to use __getattribute__
>>> rather than __getattr__. However, there may also be some checks that
>>> simply look for the presence of the attribute (see: slots), so you may
>>> find that it's even more complicated. It's usually easiest to just
>>> create the slots you want.
>>>
>>> ChrisA
>>> --
>>> https://mail.python.org/mailman/listinfo/python-list
>
>
> For numpy arrays you can find some suggestion at:
> https://numpy.org/doc/stable/user/basics.dispatch.html <https://numpy.org/doc/stable/user/basics.dispatch.html>
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> https://mail.python.org/mailman/listinfo/python-list <https://mail.python.org/mailman/listinfo/python-list>

devel / comp.lang.python / Re: Fallback for operator and other dunder methods

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