How do I use python object in C++

Aaron "Castironpi" Brady castironpi at gmail.com
Wed Sep 24 06:06:23 CEST 2008


On Sep 23, 9:30 pm, lixinyi... at gmail.com wrote:
> If the PyObject is a PyList, and all list items are strings,
> say a=['aaa','bbb','ccc']
>
> How can I have a
> myArray[0] = "aaa"
> myArray[1] = "bbb"
> myArray[2] = "ccc"
> in C++?
>
> Do I have to
> use PyModule_GetDict() to get the dict first?
> what about the next?
>
>
>
> > What do you know about the contents of 'argc' and 'argv'?  If it's
> > impossible with Py_Main, can you use one of the other entry points?
>
> > If you've never manipulated PyObject* objects in C, they can be
> > hairy.  Even if you know 'a' is a sequence, its contents are still all
> > PyObject*s, which you can access via PyList_... and PySequence_
> > functions.
>
>

This one writes '[aaa, bbb, ccc]' to the console in two different
ways.

#include <Python.h>

int main() {
    PyObject *list, *listrepr;
    Py_Initialize();

    /* first */
    list= PyList_New( 3 );
    PyList_SetItem( list, 0, PyString_FromString( "aaa" ) );
    PyList_SetItem( list, 1, PyString_FromString( "bbb" ) );
    PyList_SetItem( list, 2, PyString_FromString( "ccc" ) );

    listrepr= PyObject_Repr( list );
    printf( "%s\n", PyString_AsString( listrepr ) );

    Py_DECREF( listrepr );
    Py_DECREF( list );

    /* second */
    list= Py_BuildValue( "[sss]", "aaa", "bbb", "ccc" );
    listrepr= PyObject_Repr( list );
    printf( "%s\n", PyString_AsString( listrepr ) );

    Py_DECREF( listrepr );
    Py_DECREF( list );

    Py_Finalize();
    return 0;
}

Did you want to execute some Python code, and examine variables it
creates?



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