Python Wrapper for C++ with SWIG

demo.i

%module demo
%{
#include "test.hpp"
%}

%include "test.hpp"

howto.txt

swig -python -c++ -o _demo.cc demo.i
python3 setup.py build_ext --inplac
python3
>> import * from demo
>> addTest(18, 24)
42

setup.py

from distutils.core import setup, Extension

extension_mod = Extension("_demo", ["_demo.cc", "test.cpp"])

setup(name = "demo", ext_modules=[extension_mod])

test.cpp

#include "test.hpp"

int addTest(int i, int j) { return i + j; }

test.hpp

#ifndef TEST_H
#define TEST_H

int addTest(int i, int j);

#endif