[Python-3000] PEP 3133: Introducing Roles

[Guido van Rossum]

On 5/16/07, Benji York <benji at benjiyork.com> wrote:
> Guido van Rossum wrote:
> > On 5/14/07, Benji York <benji at benjiyork.com> wrote:
> >> Collin Winter wrote:
> >>> PEP: 3133
> >>> Title: Introducing Roles
> >> Everything included here is included in zope.interface.  See in-line
> >> comments below for the analogs.
> >
> > Could you look at PEP 3119 and do a similar analysis?
>
> Sure.
>
> > I expect that
> > the main thing missing there is that it (currently) has no way to
> > claim that a particular *object* has a certain behavior.
>
> Is "it" in that sentence the ABC PEP or zope.interface?

The ABC PEP.

> > PEP 3119 currently also doesn't have a
> > verification step -- but this could easily be added as an (optional)
> > part of the registration call.
>
> I don't care much for verification.  People using zope.interface have
> found that writing good tests is superior to on-demand verification, and
> I suspect execution time verification is a non-starter because of the
> overhead (not to mention its actual desirability, or lack thereof).

I don't care much for it either. If zope.interface users don't care
for it either, I'm happy to declare it a non-use case. I was just
thinking of how to "sell" ABCs as an alternative to current happy
users of zop.interfaces.

-- 
--Guido van Rossum (home page: http://www.python.org/~guido/)