gistfile1.py

### RPC Server Implementation File ###

import interface
import app_pb2

class ApplicationServiceImpl(app_pb2.ApplicationService):
  def __init__(self):
    self.interface = interface.ApplicationInterface()

  def CreateSystem(self, controller, request, done):
    interface.save_case('C:\\test.txt');

    response       = app_pb2.Error()
    response.error = False

    done.run(response)


### Windows Application Python Wrapper File ###

import app_pb2
import win32com

class ApplicationInterface():
  def __init__(self):
    self.app = win32com.client.Dispatch('Foo.Bar')

  def save_case(self,file):
    self.app.RunScriptCommand('SaveCase("%s")' % file)