IDisatch and pythoncom

[Manu]

Hi,
I have a COM component server that just exposes the IDispatch interface 
but when you use it in a VB app you can access other method. I think the 
way  to access the other methods( as does it VBA for ex)  is to use 
Invoke but don't know how to do it in python.
Say for ex i want to convert this very simple example with only 
IDispatch interface .

import win32com.client
o = win32com.client.Dispactch('Excel.Application')
o.WorkBooks.Add()

Thx for your help