listing17-6.c

《Beginning Python--From Novice to Professional》 的源码

#include <Python.h>

static PyObject *is_palindrome(PyObject *self, PyObject *args) {
    int i, n;
    const char *text;
    int result;
    /* "s" means a single string: */
    if (!PyArg_ParseTuple(args, "s", &text)) {
        return NULL;
    }
    /* The old code, more or less: */
    n=strlen(text);
    result = 1;
    for (i=0; i<=n/2; ++i) {
        if (text[i] != text[n-i-1]) {
            result = 0;
            break;
        }
    }
    /* "i" means a single integer: */
    return Py_BuildValue("i", result);
}

/* A listing of our methods/functions: */
static PyMethodDef PalindromeMethods[] = {
    /* name, function, argument type, docstring */
    {"is_palindrome", is_palindrome, METH_VARARGS, "Detect palindromes"},
    /* An end-of-listing sentinel: */
    {NULL, NULL, 0, NULL}
};


/* An initialization function for the module (the name is
   significant): */
PyMODINIT_FUNC initpalindrome() {
    Py_InitModule("palindrome", PalindromeMethods);
}