4

如何使用 Python C API 模拟以下 Python 函数?

def foo(bar, baz="something or other"):
    print bar, baz

(即,这样就可以通过以下方式调用它:

>>> foo("hello")
hello something or other
>>> foo("hello", baz="world!")
hello world!
>>> foo("hello", "world!")
hello, world!

)

4

1 回答 1

12

请参阅文档:您想使用PyArg_ParseTupleAndKeywords,记录在我提供的 URL 中。

例如:

def foo(bar, baz="something or other"):
    print bar, baz

变成(大致 - 没有测试过!):

#include "Python.h"

static PyObject *
themodule_foo(PyObject *self, PyObject *args, PyObject *keywds)
{
    char *bar;
    char *baz = "something or other";

    static char *kwlist[] = {"bar", "baz", NULL};

    if (!PyArg_ParseTupleAndKeywords(args, keywds, "s|s", kwlist,
                                     &bar, &baz))
        return NULL;

    printf("%s %s\n", bar, baz);

    Py_INCREF(Py_None);
    return Py_None;
}

static PyMethodDef themodule_methods[] = {
    {"foo", (PyCFunction)themodule_foo, METH_VARARGS | METH_KEYWORDS,
     "Print some greeting to standard output."},
    {NULL, NULL, 0, NULL}   /* sentinel */
};

void
initthemodule(void)
{
  Py_InitModule("themodule", themodule_methods);
}
于 2009-12-10T21:59:11.237 回答