python3调用c

c函数

#include <Python.h>

int great_function(int a) {
return a + 1;
}

static PyObject * _great_function(PyObject *self, PyObject *args) {
int _a;
int res;
if (!PyArg_ParseTuple(args, "i", &_a))
return NULL;
    res = great_function(_a);
return PyLong_FromLong(res);
}

static PyMethodDef GreateModuleMethods[] = {
    {
         "great_function",
         _great_function,
         METH_VARARGS,
         ""
    },
    {NULL, NULL, 0, NULL}
};

static struct PyModuleDef great_module = {
  PyModuleDef_HEAD_INIT,
"great_module",
  NULL,
  -1,
  GreateModuleMethods
};

PyMODINIT_FUNC PyInit_great_module(void)
{
  PyObject *m;
  m = PyModule_Create(&great_module);
if (m == NULL)
return NULL;
  printf("init great_module module\n");
return m;
}

#include <Python.h>

int great_function(int a) {
return a + 1;
}

static PyObject * _great_function(PyObject *self, PyObject *args) {
int _a;
int res;
if (!PyArg_ParseTuple(args, "i", &_a))
return NULL;
    res = great_function(_a);
return PyLong_FromLong(res);
}

static PyMethodDef GreateModuleMethods[] = {
    {
         "great_function",
         _great_function,
         METH_VARARGS,
         ""
    },
    {NULL, NULL, 0, NULL}
};

static struct PyModuleDef great_module = {
  PyModuleDef_HEAD_INIT,
"great_module",
  NULL,
  -1,
  GreateModuleMethods
};

PyMODINIT_FUNC PyInit_great_module(void)
{
  PyObject *m;
  m = PyModule_Create(&great_module);
if (m == NULL)
return NULL;
  printf("init great_module module\n");
return m;
}

setup.py

from setuptools import setup, Extension

great_module = Extension('great_module', sources=["great_module.c"])
setup(ext_modules=[great_module])

或者是用gcc

1	g++ -fPIC -shared great_class_wrap.cxx -o _great_class.so -I/usr/include/python2.7/ -lpython2.7

原始的c函数文件

#include <Python.h>

int great_function(int a) {
    return a + 1;
}

static PyObject * _great_function(PyObject *self, PyObject *args)
{
    int _a;
    int res;

    if (!PyArg_ParseTuple(args, "i", &_a))
        return NULL;
    res = great_function(_a);
    return PyLong_FromLong(res);
}

static PyMethodDef GreateModuleMethods[] = {
    {
        "great_function",
        _great_function,
        METH_VARARGS,
        ""
    },
    {NULL, NULL, 0, NULL}
};

PyMODINIT_FUNC initgreat_module(void) {
    (void) Py_InitModule("great_module", GreateModuleMethods);
}

1	gcc -fPIC -shared great_module.c -o great_module.so -I/home/xxx/miniconda2/envs/env3.6/include/python3.6m -lpython3.6m

多个参数

#include <Python.h>

int great_function(int a, int b) {
return a + b;
}

static PyObject * _great_function(PyObject *self, PyObject *args) {
int _a;
int _b;
int res;
if (!PyArg_ParseTuple(args, "ii", &_a, &_b))
return NULL;
    res = great_function(_a, _b);
return PyLong_FromLong(res);
}

static PyMethodDef GreateModuleMethods[] = {
    {
         "great_function",
         _great_function,
         METH_VARARGS,
         ""
    },
    {NULL, NULL, 0, NULL}
};

static struct PyModuleDef great_module = {
  PyModuleDef_HEAD_INIT,
"great_module",
  NULL,
  -1,
  GreateModuleMethods
};

PyMODINIT_FUNC PyInit_great_module(void)
{
  PyObject *m;
  m = PyModule_Create(&great_module);
if (m == NULL)
return NULL;
  printf("init great_module module\n");
return m;
}