Callback to Python from C

Python functions can be called from C
Step 1: for each argument, convert C data to Python objects and collect these in a tuple 
PyObject *arglist; double x, y;
/* double x,y -> tuple with two Python float objects: */
arglist = Py_BuildValue("(dd)", x, y);
Step 2: call the Python function 
PyObject *result;  /* return value from Python function */
PyObject *func1;   /* Python function object */
result = PyEval_CallObject(func1, arglist);
Step 3: convert result to C data 
double r;  /* result is a Python float object */
r = PyFloat_AS_DOUBLE(result);

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