DECREFing and PyArray functions in C Extensions

[Christian Tismer]

"Louis M. Pecora" wrote:
> 
> In article <ya0hfbig5g7.fsf at trymheim.ifi.uio.no>, Roger Hansen
> <rogerha at ifi.uio.no> wrote:
> 
> > static PyObject *
> > foo(PyObject *self, PyObject* args)
> > {
> >   PyArrayObject *array;
> >   double* a;            /* C ptr to the NumPy array data field */
> >
> >   if (!PyArg_ParseTuple(args, "O!", &PyArray_Type, &array)) {
> >     return NULL;  /* Error indicator */
> >   }
> [cut]
> >
> >   Py_INCREF(Py_None);  return Py_None;
> > }
> >
> > where f is some function. I don't need to DECREF array in this
> > example since PyArg_ParseTuple does not increase the reference count,
> > right?
> 
> That looks right to me, but what is this:
> 
> Py_INCREF(Py_None);  return Py_None;
> 
> What's going on there with Py_None?

The function is supposed to return no value.
Returning no value in Python means to INCREF and return Py_None.

ciao - chris

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