#include <Python.h>

int Add(int x, int y)
{
 return x + y;
}

int Del(int x, int y)
{
 return x - y;
}

PyObject* WrappAdd(PyObject* self, PyObject* args)
{
 int x, y;
 if (!PyArg_ParseTuple(args, "ii", &x, &y))
 {
  return NULL;
 }
 return Py_BuildValue("i", Add(x, y));
}

PyObject* WrappDel(PyObject* self, PyObject* args)
{
 int x, y;
 if (!PyArg_ParseTuple(args, "ii", &x, &y))
 {
  return NULL;
 }
 return Py_BuildValue("i", Del(x, y));
}
static PyMethodDef test_methods[] = {
 {"Add", WrappAdd, METH_VARARGS, "something"},
 {"Del", WrappDel, METH_VARARGS, "something"},
 {NULL, NULL}
};

extern "C"
void inittest1()
{
 Py_InitModule("test1", test_methods);
}

g++ -fPIC -shared test1.cpp -I/usr/include/python2.6 -o test1.so

>>> import test1
>>> test1.Add(1,2)
3

#include <boost/python/module.hpp>
#include <boost/python/def.hpp>
using namespace boost::python;

int Add(const int x, const int y)
{
 return x + y;
}

int Del(const int x, const int y)
{
 return x - y;
}

BOOST_PYTHON_MODULE(test2)
{
 def("Add", Add);
 def("Del", Del);
}

g++ test2.cpp -fPIC -shared -o test2.so -I/usr/include/python2.6 -I/usr/local/include -L/usr/local/lib -lboost_python

#!/usr/bin/env python
from distutils.core import setup
from distutils.extension import Extension

setup(name="PackageName",
 ext_modules=[
  Extension("test2", ["test2.cpp"],
  libraries = ["boost_python"])
 ])

python setup.py build

>>> import test2
>>> test2.Add(1,2)
3
>>> test2.Del(1,2)
-1

#include <boost/python.hpp>
using namespace boost::python;

class Test
{
public:
 int Add(const int x, const int y)
 {
  return x + y;
 }

 int Del(const int x, const int y)
 {
  return x - y;
 }
};

BOOST_PYTHON_MODULE(test3)
{
 class_<Test>("Test")
  .def("Add", &Test::Add)
  .def("Del", &Test::Del);
}

class_<Test>("Test").def("Add", &Test::Add);
class_<Test>("Test").def("Del", &Test::Del);

g++ test3.cpp -fPIC -shared -o test3.so -I/usr/include/python2.6 -I/usr/local/include/boost -L/usr/local/lib -lboost_python

>>> import test3
>>> test = test3.Test()
>>> test.Add(1,2)
3
>>> test.Del(1,2)
-1

#include <boost/python.hpp>
using namespace boost::python;

class Test
{
public:
 int Add(const int x, const int y, const int z = 100)
 {
  return x + y + z;
 }
};

int Del(const int x, const int y, const int z = 100)
{
 return x - y - z;
}

BOOST_PYTHON_MEMBER_FUNCTION_OVERLOADS(Add_member_overloads, Add, 2, 3)
BOOST_PYTHON_FUNCTION_OVERLOADS(Del_overloads, Del, 2, 3)

BOOST_PYTHON_MODULE(test4)
{
 class_<Test>("Test")
  .def("Add", &Test::Add, Add_member_overloads(args("x", "y", "z"), "something"));
 def("Del", Del, Del_overloads(args("x", "y", "z"), "something"));
}

g++ test4.cpp -fPIC -shared -o test4.so -I/usr/include/python2.6 -I/usr/local/include/boost -L/usr/local/lib -lboost_python

>>> import test4
>>> test = test4.Test()
>>> print test.Add(1,2)
103
>>> print test.Add(1,2,z=3)
6
>>> print test4.Del(1,2)
-1
>>> print test4.Del(1,2,z=3)
-1

def Square(list_a)
{
 return [x * x for x in list_a]
}

#include <boost/python.hpp>

boost::python::list Square(boost::python::list& data)
{
 boost::python::list ret;
 for (int i = 0; i < len(data); ++i)
 {
  ret.append(data[i] * data[i]);
 }

 return ret;
}

BOOST_PYTHON_MODULE(test5)
{
 def("Square", Square);
}

g++ test5.cpp -fPIC -shared -o test5.so -I/usr/include/python2.6 -I/usr/local/include/boost -L/usr/local/lib -lboost_python

>>> import test5
>>> test5.Square([1,2,3])
[1, 4, 9]

boost::python::tuple(int a, int b, int c)
{
 return boost::python::make_tuple(a, b, c);
}