DECREFing and PyArray functions in C Extensions

[Louis M. Pecora]

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?