[Python-Dev] sys.implementation

Antoine Pitrou solipsis at pitrou.net
Wed May 9 16:50:39 CEST 2012

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.

We have a similar problem with ABCs: io jumps through hoops to register
its implementation classes with the I/O ABCs.



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