Extening Python with C

hellomodule.c

#include <Python.h>
 
static PyObject* say_hello(PyObject* self, PyObject* args)
{
    const char* name;
 
    if (!PyArg_ParseTuple(args, "s", &name))
        return NULL;
 
    printf("Hello %s!\n", name);
 
    Py_RETURN_NONE;
}

static PyObject* say_ihello(PyObject* self, PyObject* args)
{
    int name;
 
    if (!PyArg_ParseTuple(args, "i", &name))
        return NULL;
    name++;
    printf("Hello %i!\n", name);
 
    Py_RETURN_NONE;
}

static PyMethodDef HelloMethods[] =
{
     {"say_hello", say_hello, METH_VARARGS, "Greet somebody."},
     {"say_ihello", say_ihello, METH_VARARGS, "Greet somebody."},
     {NULL, NULL, 0, NULL}
};

static struct PyModuleDef hellomodule = {
   PyModuleDef_HEAD_INIT,
   "hello",   /* name of module */
   NULL, /* module documentation, may be NULL */
   -1,       /* size of per-interpreter state of the module,
                or -1 if the module keeps state in global variables. */
   HelloMethods
};

 
PyMODINIT_FUNC
PyInit_hello(void)
{
    PyObject *m;
    m = PyModule_Create(&hellomodule);
    if (m == NULL)
        return NULL;
    return m;
}

setup.py

from setuptools import setup, Extension
 
module1 = Extension('hello', sources = ['hellomodule.c'])

setup (name = 'PackageName',
       version = '1.0',
       description = 'This is a demo package',
       ext_modules = [module1])