At 04:52 PM 11/30/2007 +0000, Paul Moore wrote:
>On 30/11/2007, Barry Warsaw <[EMAIL PROTECTED]> wrote:
> > >> class Example:
> > >> implements(IExample)
> >
> > This frame hacking is also a pretty common feature of other types of
> > systems, such as ORMs. It can make certain Python code much more
> > readable, so "frame hacking" is clearly a useful feature, at least it
> > seems, in the context of a class definition. Is there a way to
> > promote this to an API that's more principled than the sys._getframe
> > () hack, and thus more acceptable to Guido and more portable to other
> > implementations?
> >
> > (Or is something like this already in Py3K, and I just haven't
> > noticed it yet? ;).
>
>There's class decorators:
>
> @implements(IExample)
> class Example:
> pass
>
>which could provide the same result in effect, but (as J-P points out)
>it's still an API change and so not a direct replacement. IIRC, one of
>the arguments for class decorators was that they are a way to avoid
>the need for some of this getframe hacking, though.
Well, for what class-level frame hacking is typically used for, it
would suffice to have a convenient way to refer to the local
namespace, e.g. if you could do something like:
implements(@, IExample)
where @ was a shortcut for locals(). The most-used frame hacks (in
zope.interface and most PEAK tools) just want to access the namespace
of the current class definition, and maybe decorate the class in some way.
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