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I'm writing a Python Module using the C extension API and am trying to pass a long variable from Python into the C function and then from that get the raw PyLongObject used to represent this variable.

I'm using the PyArg_Parse function to parse the variable into a raw C Pointer. I'm expecting the PyObject returned to be of type PyLongObject, however whenever I inspect the value of the typename for the parsed object its always of type 'frame'? What am I missing?

static PyObject* test(PyObject *self, PyObject *args)
{
    PyObject *num;

    if(!PyArg_Parse(args, "0", &num))
    {
        //ERROR YO
    }

    printf("\n%s\n", num->ob_type->tp_name);

    Py_RETURN_NONE;
}
ali2992
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1 Answers1

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It looks as if you are passing an invalid argument format specification (never saw a 0 (zero) there). As a result, you get an exception which you don't deal with, but treat the return-value in "num" as if it was a successful value. On top of that, you are using a deprecated function to parse the arguments.

deets
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  • Ah! Thank you! What it turned out to be was me misreading the documentation of `O (object) [PyObject *]` to be a 0 and not a O. By properly handling my errors instead of being lazy I realised this, thanks! – ali2992 Oct 12 '14 at 14:10