[C++-sig] Embending : Expose and Extract a dictionary object To/From C++

[Constant Dupuis]

Hi,

I would like to expose a dictionary object instanciated in C++ to a
Python code, which manipulate the dictoinary.
And after extract the resulting modified dictionary back in C++.

I try this :

try {

    Py_Initialize();

        std::cout << "Hello, World!\n";
        
        dict d;
        d["Headline"] = "Titre";
        
        object main_module = import("__main__");
        object main_namespace = main_module.attr("__dict__");

        main_namespace["iptc"] = ptr(&d);
        
        object ignored = exec("print('Headline')\n"
                                                        
"print(iptc['Headline'])\n",
                                                main_namespace);

                                                
} catch( error_already_set ) {
    PyErr_Print();
}

And here is hte output :

Hello, World!
Headline
Traceback (most recent call last):
  File "<string>", line 2, in <module>
TypeError: 'NoneType' object is unsubscriptable

What did I missed ?

Thanks en regards,

Constant
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