source: python/vendor/Python-2.6.5/Modules/future_builtins.c

/* future_builtins module */

/* This module provides functions that will be builtins in Python 3.0,
   but that conflict with builtins that already exist in Python
   2.x. */


#include "Python.h"

PyDoc_STRVAR(module_doc,
"This module provides functions that will be builtins in Python 3.0,\n\
but that conflict with builtins that already exist in Python 2.x.\n\
\n\
Functions:\n\
\n\
hex(arg) -- Returns the hexadecimal representation of an integer\n\
oct(arg) -- Returns the octal representation of an integer\n\
\n\
The typical usage of this module is to replace existing builtins in a\n\
module's namespace:\n \n\
from future_builtins import hex, oct\n");

static PyObject *
builtin_hex(PyObject *self, PyObject *v)
{
        return PyNumber_ToBase(v, 16);
}

PyDoc_STRVAR(hex_doc,
"hex(number) -> string\n\
\n\
Return the hexadecimal representation of an integer or long integer.");


static PyObject *
builtin_oct(PyObject *self, PyObject *v)
{
        return PyNumber_ToBase(v, 8);
}

PyDoc_STRVAR(oct_doc,
"oct(number) -> string\n\
\n\
Return the octal representation of an integer or long integer.");


static PyObject *
builtin_ascii(PyObject *self, PyObject *v)
{
        return PyObject_Repr(v);
}

PyDoc_STRVAR(ascii_doc,
"ascii(object) -> string\n\
\n\
Return the same as repr().  In Python 3.x, the repr() result will\n\
contain printable characters unescaped, while the ascii() result\n\
will have such characters backslash-escaped.");

/* List of functions exported by this module */

static PyMethodDef module_functions[] = {
        {"hex",         builtin_hex,        METH_O, hex_doc},
        {"oct",         builtin_oct,        METH_O, oct_doc},
        {"ascii",       builtin_ascii,      METH_O, ascii_doc},
        {NULL,          NULL}   /* Sentinel */
};


/* Initialize this module. */

PyMODINIT_FUNC
initfuture_builtins(void)
{
        PyObject *m, *itertools, *iter_func;
        char *it_funcs[] = {"imap", "ifilter", "izip", NULL};
        char **cur_func;

        m = Py_InitModule3("future_builtins", module_functions, module_doc);
        if (m == NULL)
                return;

        itertools = PyImport_ImportModuleNoBlock("itertools");
        if (itertools == NULL)
                return;

        for (cur_func = it_funcs; *cur_func; ++cur_func){
                iter_func = PyObject_GetAttrString(itertools, *cur_func);
                if (iter_func == NULL)
                        return;
                PyModule_AddObject(m, *cur_func+1, iter_func);
        }
        Py_DECREF(itertools);
        /* any other initialization needed */
}