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Wed May 9 17:09:27 CEST 2012 · https://mail.python.org/pipermail/python-dev/2012-May/119399.html

On Wed, May 9, 2012 at 10:50 AM, Antoine Pitrou <solipsis at pitrou.net> wrote:

> On Wed, 9 May 2012 10:44:59 -0400
> Brett Cannon <brett at python.org> wrote:
> >
> > > I wish there was a builtin class
> > >
> > >     class record:
> > >        pass
> > >
> > >   which can be used to create objects which have only attributes
> > >   and no methods.
> >
> >
> > I have heard this request now a bazillion times over the years. Why don't
> > we have such an empty class sitting somewhere in the stdlib with a
> > constructor classmethod to simply return new instances (and if you want
> to
> > get really fancy, optional keyword arguments to update the instance with
> > the keys/values passed in)? Is it simply because it's just two lines of
> > Python that *everyone* has replicated at some point?
>
> In this case, it's because sys is a built-in module written in C, and
> importing Python code is a no-go.
>

Sure, but couldn't we define this "empty" class in C code so that you can
use the C API with it as well and just provide a C function to get a new
instance?

-Brett

>
> We have a similar problem with ABCs: io jumps through hoops to register
> its implementation classes with the I/O ABCs.
>
> Regards
>
> Antoine.
>
>
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[Python-Dev] sys.implementation