embedding python - PyImport_ImportModule returns null

[Bjorn Pettersen]

> From: Alex Martelli [mailto:aleax at aleax.it] 
> 
> JW wrote:
> 
> > I am trying to embed python within a c program, but I can't get
> > PyImport_ImportModule() command to load my module.
> > Please let me know what I'm doing wrong.
>    ...
> > Both main.c and func.py are in the same directory.
> > I run main and get the error
> > Failed to load "func", meaning that PyImport_ImportModule 
> returns NULL.
> 
> The current directory is not necessarily on sys.path.  Notice:

Hi Alex,

Perhaps you would know how to import a module so that it can be used in
PyRun_String()? I've tried PyImpor_Import, PyImport_ImportModule, and
PyImport_ImportModuleEx which all imported the module but didn't make it
visible.

void main() {    
    Py_Initialize();
    PySys_SetPath(Py_GetPath());


    PyObject* mainmod = PyImport_AddModule("__main__");
    Py_INCREF(mainmod);
    PyObject* ns = PyModule_GetDict(mainmod);
    Py_INCREF(ns);

    PyObject* timeModule = PyImport_ImportModuleEx("time", ns, ns,
NULL);
    if (!timeModule) std::cout << getTraceback() << std::endl;
    std::cout << "time module imported successfully" << std::endl;

    PyObject* timeFn = PyRun_String("time.time", Py_eval_input, ns, ns);

    if (!timeFn) std::cout << getTraceback() << std::endl;

    Py_XDECREF(timeModule);
    Py_XDECREF(timeFn);
    Py_DECREF(ns);
    Py_DECREF(mainmod);
    Py_Finalize();
}

and the output:

Adding parser accelerators ...
Done.
time module imported successfully
Traceback (most recent call last):
  File "<string>", line 0, in ?
NameError: name 'time' is not defined

[4099 refs]

-- bjorn