Function PyArray_Sum

numpy/core/src/multiarray/calculation.c:481–494

NUMPY_API *Sum */

 *Sum
 */
NPY_NO_EXPORT PyObject *
PyArray_Sum(PyArrayObject *self, int axis, int rtype, PyArrayObject *out)
{
    PyObject *arr, *ret;

    arr = PyArray_CheckAxis(self, &axis, 0);
    if (arr == NULL) {
        return NULL;
    }
    ret = PyArray_GenericReduceFunction((PyArrayObject *)arr, n_ops.add, axis,
                                        rtype, out);
    Py_DECREF(arr);
    return ret;
}

/*NUMPY_API
 * Prod