template for python extension in C

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

PyMODINIT_FUNC

inithello(void)
{
  (void) Py_InitModule("hello", HelloMethods);
}