Langage C pour voir et se souvenir de la partie 5 Appel du langage C à partir du tableau Python (argument)

import myModule as capi
import random
x=[random.uniform(0, 100) for x in range(100)]
s=0.0
for a in x:
    s=s+a
print("c ",s,s/len(x))
a=capi.fsum_avr(x)
print("py",a)

Quand tu cours
>python capi.py
py 5025.24247203747 50.252424720374705
c  (5025.24247203747, 50.252424720374705)

#include <Python.h>
static PyObject* fsum_avr(PyObject* self, PyObject* args)
{
    long n;
    double sum=0.0,avr,a;
    PyObject* c_list, *item;
    if (!PyArg_ParseTuple(args, "O", &c_list)) return NULL;   
    // Check list
    if PyList_Check(c_list) n = PyList_Size(c_list);
    else return NULL;
    for (int i = 0; i < n; i++){
        item = PyList_GetItem(c_list, i);
        a = PyFloat_AsDouble(item); // Increment the reference count
        sum = sum + a;
        Py_DECREF(item); // Decrement the reference count
    }
    avr=sum/n;
    return Py_BuildValue("(dd)",sum,avr);
}
static PyMethodDef myMethods[] = {
    { "fsum_avr",fsum_avr, METH_VARARGS, "sum avr"},
    { NULL }
};
static struct PyModuleDef myModule = {
    PyModuleDef_HEAD_INIT,"myModule","C API Module",-1,myMethods
};
PyMODINIT_FUNC PyInit_myModule(void){
    return PyModule_Create(&myModule);
}

from distutils.core import setup, Extension
setup(name = 'myModule', version = '1.0.0',  \
   ext_modules = [Extension('myModule', ['capilib.c'])])

capi>python setup.py install

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