if (myDef) {
  /* MyClass = my_def.MyClass */
  PyObject *myClass = PyObject_GetAttrString(myDef, "MyClass");
  
  if (myClass) {
    /* instance = MyClass() */
    PyObject *instance = PyObject_CallObject(myClass, NULL);

    if (instance) {
      /* noneResult = instance.Test() */
      PyObject *noneResult = PyObject_CallMethod(instance, "Test", NULL);

      if (noneResult == Py_None) {
        printf("None returned\n");
      }
      Py_XDECREF(instance);
    }
    Py_XDECREF(myClass);
  }
  Py_XDECREF(myDef);
}