[Python-Dev] METH_CLASS

Thomas Heller thomas.heller@ion-tof.com
Thu, 25 Apr 2002 15:26:11 +0200

From: "Guido van Rossum" <guido@python.org>
> > The devel-docs tell me about METH_CLASS:
> > 2. Since this is marked new in 2.3: Is it planned to backport
> > this stuff into the 2.2.x series?
> > Requiring Python 2.3 for my stuff seems a but harsh currently...
> I don't plan to backport this to 2.2 unless there's an overwhelming
> demand.

What do you accept as overwhelming? The only person I could think
of currently beside me is David Abrahams, but maybe I'm wrong ;-)

> You have to call classmethod() from C; it's available as
> &PyClassMethod_Type, you can call it with e.g. PyObject_Call.  The
> argument should be a function object that you created by calling
> PyCFunction_New.  Then stick it into your type's tp_dict (after
> calling PyType_Ready()).
> I know that's complicated; that's why we added METH_CLASS. :-)
> I'd recommend against trying this unless you absolutely need it.

I need it, so I asked :-) But I'm fine with your recipe (in these cases
where I don't have a custom metaclass).