Pickling extension types

[Stefan Kuzminski]

closer I think

1) I changed tp_name to be 'observation.MV' ( module is named observation.c
) and now I get a new error..

PicklingError: Can't pickle <type 'observation.MV'>: import of module
observation failed

2) here is the init function, sorry I did not include it in the original
listing

void initobservation(void) {

  PyObject *m;
  m = Py_InitModule("observation", observation_methods);

  Py_INCREF(&PyMV_Type);
  PyModule_AddObject(m, "MV", (PyObject *)&PyMV_Type);

}

thx,
S

On Tue, May 3, 2011 at 6:05 PM, Robert Kern <robert.kern at gmail.com> wrote:

> On 5/3/11 4:34 PM, Stefan Kuzminski wrote:
>
>> Thanks for the clues, I made a modification so that reduce returns this..
>>
>>   return Py_BuildValue("O(OOOOO)", Py_TYPE(self), PyTuple_New(0), Py_None,
>> Py_None, Py_None );
>>
>> and now I get this different error when trying to pickle the type..
>>
>>  ----------------------------------------------------------------------
>> Traceback (most recent call last):
>>   File "test_missing.py", line 16, in test
>>     print cPickle.dumps( mv )
>> PicklingError: Can't pickle <type 'MV'>: attribute lookup __builtin__.MV
>> failed
>>
>
> You need to do two things:
>
> 1. Set tp_name to something like "mymodule.MV" where "mymodule" is the name
> of your extension module.
>
> 2. Make sure that you add the type object to your module's namespace.
>
> PyMODINIT_FUNC
> initmymodule(void) {
>  ...
>  Py_INCREF(&PyMV_Type);
>  PyModule_AddObject(m, "MV", (PyObject*)&PyMV_Type);
> }
>
> C.f.
>
> http://docs.python.org/extending/newtypes.html
>
> --
> Robert Kern
>
> "I have come to believe that the whole world is an enigma, a harmless
> enigma
>  that is made terrible by our own mad attempt to interpret it as though it
> had
>  an underlying truth."
>  -- Umberto Eco
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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