[Python-Dev] C-level duck typing

[Greg Ewing]

Dag wrote:

> I'm not asking you to consider the details of all that. 
> Just to allow some kind of high-performance extensibility of 
> PyTypeObject, so that we can *stop* bothering python-dev with 
> specific requirements from our parallel universe of 
> nearly-all-Cython-and-Fortran-and-C++ codebases :-)

Maybe you should ask for a bit more than that.

Tp_flags bits are a scarce resource, and they shouldn't
be handed out lightly to anyone who asks for one. Eventually
they're going to run out, and then something else will have to
be done to make further extensions of the type object possible.

So maybe it's worth thinking about making a general mechanism
available for third parties to extend the type object without
them all needing to have their own tp_flags bits and without
needing to collude with each other to avoid conflicts.

-- 
Greg