FEEDBACK WANTED: Type/class unification

[Guido van Rossum]

Paul Moore <paul.moore at uk.origin-it.com> writes:

> On Mon, 20 Aug 2001 11:00:37 +0200, Paul Moore <paul.moore at uk.origin-it.com>
> wrote:
> 
> >So I looked through PEP 252 looking for a simple summary of how to add
> >"subclassability" to an existing C type. I could find nothing.
> 
> Doh. If I'd looked in PEP 253, I'd have seen it. Looks fairly messy,
> though...

That's C extensions for ya...

> Maybe a simple example would help. (I assume a simple example is possible -
> otherwise, I don't imagine that many 3rd party extension types will end up
> supporting this...)

The simplest example at the moment is probably the list type...

I'll try to add a working example to Modules/xxsubtype.c (which
already shows how to subclass in C, but not really what to do to
create a subclassable type).

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