[Python-Dev] sys.implementation (original) (raw)

Brett Cannon brett at python.org
Wed May 9 17:09:27 CEST 2012

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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