advanced-go-programming-book/examples/ch2.10/hello-py/main.go

// Copyright © 2017 ChaiShushan <chaishushan{AT}gmail.com>.
// License: https://creativecommons.org/licenses/by-nc-sa/4.0/

package main

/*
// macOS:
#cgo darwin pkg-config: python3

// linux
#cgo linux pkg-config: python3

// windows
// should generate libpython3.a from python3.lib

#define Py_LIMITED_API
#include <Python.h>

extern PyObject* PyInit_gopkg();
extern PyObject* Py_gopkg_sum(PyObject *, PyObject *);

static int cgo_PyArg_ParseTuple_ii(PyObject *arg, int *a, int *b) {
	return PyArg_ParseTuple(arg, "ii", a, b);
}

static PyObject* cgo_PyInit_gopkg(void) {
	static PyMethodDef methods[] = {
		{"sum", Py_gopkg_sum, METH_VARARGS, "Add two numbers."},
		{NULL, NULL, 0, NULL},
	};
	static struct PyModuleDef module = {
		PyModuleDef_HEAD_INIT, "gopkg", NULL, -1, methods,
	};
	return PyModule_Create(&module);
}
*/
import "C"

func main() {}

//export PyInit_gopkg
func PyInit_gopkg() *C.PyObject {
	return C.cgo_PyInit_gopkg()
}

//export Py_gopkg_sum
func Py_gopkg_sum(self, args *C.PyObject) *C.PyObject {
	var a, b C.int
	if C.cgo_PyArg_ParseTuple_ii(args, &a, &b) == 0 {
		return nil
	}
	return C.PyLong_FromLong(C.long(a + b))
}