[ Please help ] how to create Python functions in C++ at runtime & call them

[grbgooglefan]

I want to compile following type of python function in my C++ program
at runtime.
def isSizeSmall(size,vol,ADV,prod):
   if ( (size < 1000) & (vol < (0.001 * ADV)) & (prod=="Stock")):
print "OK"; return 10
   else: print "NOK"; return 11

Using Py_CompileString, I compiled a code object from this function,
like:
   char szExpr[2048];
   sprintf(szExpr,"def isSizeSmall(size,vol,ADV,prod):\n  if ( (size <
1000) & (vol < (0.001 * ADV)) & (prod==\"Stock\")): print \"OK\";
return 10\n  else: print \"NOK\"; return 11\n\n\n");

   PyObject* result = Py_CompileString(szExpr,"<string>",
Py_file_input);

Then, I tried to call this function in 3 different ways: 1)
PyEval_EvalCode, 2) PyObject_CallObject.
But both failed.

For using PyObject_CallObject, I did something like this.

   PyObject* tuple = PyTuple_New(4);
   PyObject* val = 0;

   val = PyInt_FromLong(ordval.size);
   PyTuple_SetItem(tuple,0,val);

   val = PyInt_FromLong(ordval.vol);
   PyTuple_SetItem(tuple,1,val);

   val = PyInt_FromLong(ordval.ADV);
   PyTuple_SetItem(tuple,2,val);

   val = PyString_FromString(ordval.prod);
   PyTuple_SetItem(tuple,3,val);

   PyObject *glb = PyDict_New();
   PyDict_SetItemString(glb, "__builtins__", PyEval_GetBuiltins());

     PyObject* func = PyFunction_New(result,glb);
     if(!func || PyErr_Occurred()){
       printf("Failed to get Function..\n");
       PyErr_Print();
     } else {
         printf("Calling PyObject_CallObject\n");
         if(PyCallable_Check(func))
           printf("func is callable\n");
         PyObject* ret = PyObject_CallObject(func, tuple);
         if(!ret || PyErr_Occurred())
           PyErr_Print();
         else
           printf("PyObject_CallObject evaluated..\n");
     }

I got this output. Why is it so? Why is this function not taking any
parameters? Please help.

Expression to eval =
[def isSizeSmall(size,vol,ADV,prod):
  if ( (size < 1000) & (vol < (0.001 * ADV)) & (prod=="Stock")): print
"OK"; return 10
  else: print "NOK"; return 11

]
func is callable
TypeError: ?() takes no arguments (4 given)

Thanks for all help & guidance