Get callable arguments count in CPython?

Question

I have Python C-Extension function that takes a callable as parameter to act as a callback. I have two types of callbacks, each one with different number of arguments. I want to detect the callback type according to the count of its arguments.

Is there a direct way as I already have the PyObject* here, instead of calling inspect module ?

static PyObject *RegisterCallback(PyObject *self, PyObject *args, PyObject *kwdict)
{
    PyObject* callback;

    static char *kwlist[] = { "callback", NULL};
    
    if (!PyArg_ParseTupleAndKeywords(args, kwdict, "O", kwlist, &callback))
        return NULL;

    if(!PyCallable_Check(callback))
    {
        PyErr_SetString(PyExc_ValueError, "The callback should be callable function or callable object.");
        return NULL;
    }

    int args_count = ????
    bool registration_result = register_the_callback(callback);
    if (registration_result )
    {
        Py_RETURN_TRUE;
    }
    else
        Py_RETURN_FALSE;

}

Note: Targeted Python: 2.7, 3.x.

N.B: I already know that python 2.x is dead and we keep it due to customer's request.

question from:https://stackoverflow.com/questions/65894002/get-callable-arguments-count-in-cpython

Answer 1

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