[Python-Dev] Feature request: better support for "wrapper" objects

[Thomas Heller]

From: "M.-A. Lemburg" <mal@lemburg.com>
> [Metatypes, callbacks, etc.]
> 
> Wouldn't it be *much* easier to just use the copyreg/pickle 
> API/protocol for dealing with all this ? 
> 
I *don't* think it's complicated (once you get used to metatypes).

> AFAICTL, the actions needed by Jack are very similar to what 
> pickle et al. do, and we already have all that in Python -- 
> it's just not exposed too well at C level. 
> 
> Example:
> 
> PyArg_ParseTuple(args, "O@", &factory, &tuple) would
> return a factory function and a tuple storing the data of
> the object passed to the function
> 
> while
> 
> Py_BuildValue("O@", factory, tuple) would simply call factory
> with tuple and use the return value as object.
> 
> (Note that void* can be wrapped into PyCObjects for "use" in
> Python.)
> 
I'm not sure we talk about the same thing: we (at least me) do not
want to serialize and reconstruct objects (what pickle does),
we want to convert objects from Python to C (convert them to parameters
usable in C API-calls), and back (convert them from handles, pointers,
whatever into Python objects) having only the Python *type* object
available in the latter case.

Or am I missing something?

Thomas