93,98c93
<     python::handle<> class_ptr( 
<         PyRun_String("PythonDerived\n", Py_eval_input, 
<                      main_namespace.ptr(), main_namespace.ptr()) );
< 
<     // Wrap the raw Python object in a Boost.Python object
<     python::object PythonDerived(class_ptr);
---
>     python::object PythonDerived = main_namespace["PythonDerived"];
109c104
<     Base& py = python::extract<Base&>(py_base)();
---
>     Base& py = python::extract<Base&>(py_base);