Embedding python question: PyRun_String only returns None no

[Gordon McMillan]

Dave Kuhlman replies to a query about PyRun_SimpleString...

> When you embed Python in an application, the application often
> exposes functions that are callable from Python scripts.  You could
> provide a function named setReturnValue(value), which when called,
> passed a Python object (the value).  The script calls this function,
> and then, when it exits, the embedding application (the caller of
> PyRun_String or PyRun_SimpleString) uses the Python value saved by
> this function.

With all the error checking and some app specific logic removed, 
here's some code that loads a module and calls a specific function in 
that module:

   module = PyImport_ImportModule("mymodule");
   moduledict = PyModule_GetDict(module);
   func = PyDict_GetItemString(moduledict, "CheckMenu");
   args = Py_BuildValue("(ss)", "spam", "eggs");
   retval = PyEval_CallObjectWithKeywords(func, args, (PyObject
   *)NULL)
   Py_XINCREF(retval);
   rc = PyArg_Parse(retval, "s", &str);
   Py_XDECREF(retval);
   Py_XDECREF(module);

- Gordon