编写python扩展

代码：

#include <Python.h>
static PyObject *
spam_system(PyObject *self, PyObject *args)
{
    const char *command;
    int sts;

    if (!PyArg_ParseTuple(args, "s", &command))
        return NULL;
    sts = system(command);
    return PyLong_FromLong(sts);
}

static PyMethodDef SpamMethods[] = {
{"system",  spam_system, METH_VARARGS,
"Execute a shell command."},
{NULL, NULL, 0, NULL}        /* Sentinel */
};

static struct PyModuleDef spammodule = {
    PyModuleDef_HEAD_INIT,
    "spam",   /* 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. */
    SpamMethods
};

PyMODINIT_FUNC
PyInit_spam(void)
{
    return PyModule_Create(&spammodule);
}

编译选项：

releaee版

dll名字必须为spam.pyd

测试：

>>> import spam
>>> dir(spam)
['__doc__', '__file__', '__loader__', '__name__', '__package__', '__spec__', 'system']
>>> spam.system('dir')
驱动器 G 中的卷是 ll6_za
卷的序列号是 C0F5-30DE

G: empConsoleApplication1Release 的目录

2018/03/19 00:38 <DIR> .
2018/03/19 00:38 <DIR> ..
2018/03/19 00:36 746 ConsoleApplication1.exp
2018/03/19 00:36 27,307 ConsoleApplication1.iobj
2018/03/19 00:36 33,648 ConsoleApplication1.ipdb
2018/03/19 00:36 1,942 ConsoleApplication1.lib
2018/03/19 00:36 512,000 ConsoleApplication1.pdb