_newmath.c

#define Py_LIMITED_API
#include <Python.h>
#include "libnewmath.h"


PyObject *sum_wrapper(PyObject *obj, PyObject *args) {
    const long a, b;

    if (!PyArg_ParseTuple(args, "LL", &a, &b))
        return NULL;

    return PyLong_FromLong(sum(a, b));
}


static PyMethodDef NewMathMethods[] = {
    {"sum", sum_wrapper, METH_VARARGS, "Add two numbers."},
    {NULL, NULL, 0, NULL}
};

// ...