[Python-Dev] C-level duck typing

["Martin v. Löwis"]

> Does this use case make sense to everyone?
>
> The reason why we are discussing this on python-dev is that we are looking
> for a general way to expose these C level signatures within the Python
> ecosystem. And Dag's idea was to expose them as part of the type object,
> basically as an addition to the current Python level tp_call() slot.

The use case makes sense, yet there is also a long-standing solution 
already to expose APIs and function pointers: the capsule objects.

If you want to avoid dictionary lookups on the server side, implement
tp_getattro, comparing addresses of interned strings.

Regards,
Martin