I'm trying to embed Python for application scripting in my C# solution. I've managed to load the Python module form C#; but how do I get the Python script to call back into the application? The "from MODULE import CLASS" semantics throw an exception here; and I think it's because the class being called is in the same process (not in a dll). Here's the test C# code: using System; using Python.Runtime; namespace PyTest { /// <summary> /// Summary description for Class1. /// </summary> public class PyTestClass { PyObject module = null; public PyTestClass() { PythonEngine.Initialize(); } ~PyTestClass() { PythonEngine.Finalize(); } public void PyMessage() { Console.WriteLine("PyMessage() has been called."); } /// <summary> /// The main entry point for the application. /// </summary> [STAThread] static void Main(string[] args) { PyTestClass pyTest = new PyTestClass(); try { if(!PythonEngine.IsInitialized) throw new Exception("PythonEngine not initialized."); pyTest.module = PythonEngine.ImportModule("PyTest"); } catch(Exception e) { Console.WriteLine(e.Message); Console.Write(e.StackTrace); } } } } And the Python script: from PyTest.PyTest import PyTestClass def test(): print "testing." PyTestClass.PyMessage() test(); I know the embedding is working; because when the module is loaded, if I comment out the import line and the call to the PyTestClass in the script, the string "testing." is output to the console. But once I put in the stuff that calls back into the C# code, it throws a PythonException. Any ideas? Thanks, SI