[Zope3-dev] interface conventions: default=_RAISE_ERROR

[Gary Poster]

On Friday 10 May 2002 08:26 pm, Guido van Rossum wrote:
> > > in the __init__ of the Interfaces package.  An interface that wants to
> > > use the default marker would simply
> > > from Interface import Interface, _RAISE_ERROR
> > > and implementations could import from their interfaces or from the
> > > original declaration in the Interface package.
> >
> > I really wouldn't bother. It saves very little typing, adds to the
> > complexity of finding out what things really mean, adds another
> > dependency, and saves a few hundred bytes at most per runtime.
>
> While we're at it, I don't particularly like the pattern.  If it is
> used I think there should be a *public* value so that a caller can be
> explicit about "I want the exception" rather than having to use a
> short argument list.
>
> Where this is used, would it be acceptable if the exception itself
> (KeyError?) was specified as the default value?  Or is an exception a
> valid regular default?
>
> --Guido van Rossum (home page: http://www.python.org/~guido/)


Yup, better solution.  As far as I'm concerned, at least.  Can I start using 
this, folks?

Gary