Passing python method's reference to C as callback

Question

Can we pass a reference of python method as an argument to C. This method is a callback method which will be executed after the C code has been executed.

Answer 1

In the Python C-API, Python objects are simply PyObject references. PyObject references can be called using PyObject_Call (if you want to have more descriptive errors, you can call PyCallable_Check, first.)

Assuming you've extended a module using the API you would have a method as follows:

bool call_method(PyObject *method)
{
    PyObject *args = PyTuple_New(0);
    if ( NULL == PyObject_Call(method, args, NULL) )
    {
        // Method call failed
        return false;
    }
    return true;
}

Then, in Python, you call the method using the following:

import my_module as bla

bla.call_method(myClass.myMethod)