用C语言扩展Python

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <Python.h>
#define BUFFSIZE 1000

int fact(int n){
    if(n < 2){
        return 1;
    }
    return fact(n - 1) + fact(n - 2);
}

char* reverseString(char *origin){
     char temp;
     int length = strlen(origin);
     int end = strlen(origin)-1;
     int start = 0;
     printf("%s\n",origin);
     while (start <= end){
         temp = origin[start];
         origin[start] = origin[end];
         origin[end] = temp;
         start++;
         end--;
     }
     return origin;
}
static PyObject *ExtEx_fact(PyObject *self, PyObject *args){
    int num;    //Hold arguments of fact()
    if(!PyArg_ParseTuple(args, "i", &num)){    //parse python‘s args into C‘s int args("i")
        return NULL;
    }
    return (PyObject*)Py_BuildValue("i", fact(num));
}
static PyObject *ExtEx_reverse(PyObject *self, PyObject *args){
    char *string;
    char *temp;
    PyObject *result;
    if(!PyArg_ParseTuple(args, "s", &string)){
        return NULL;
    }
    result = (PyObject *)Py_BuildValue("ss", string, temp=reverseString(strdup(string)));
    free(temp);
    return result;
}
static PyMethodDef ExtExMethods[] = {
    {"fact", ExtEx_fact, METH_VARARGS},
    {"reverseString", ExtEx_reverse, METH_VARARGS},
    {NULL, NULL},
};
static struct PyModuleDef ExtEx = {
    PyModuleDef_HEAD_INIT,
    "ExtEx",
    NULL,
    -1,
    ExtExMethods,
    NULL,
    NULL,
    NULL,
    NULL
};
void initExtEx(){
    PyModule_Create(&ExtEx);
}

from distutils.core import setup, Extension
setup(name=‘ExtEx‘, version=‘1.0‘,        ext_modules=[Extension(‘ExtEx‘, [‘ExtEx.c‘])])