[python-win32] Adding an "Interface" from IDL / tlb files to an existing win32COM-Object

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Hallo, 
I need help in adding an existing Interface to an object I dispatched from a COM-server via win32com in Python. 

The Code for this in VisualBasic looks like that: 

Private Obj_1 As Obj1_LIB.Impl_1 
Private mHelper As Object 
Private m_applJob As Object 
Private m_applModul As interface_Module //interface_Module is described in an IDL/TLB-File 
Private cont As Boolean 
Private c_applJob As New ApplicationJob.Job 

Set m_Obj_1 = CreateObject("Obj1_LIB.Impl_1") 
m_Obj_1.Init 

Set mHelper = CreateObject("ModulHelper.Helper") 
Set m_applJob = CreateObject("ApplicationJob.Job") 
Set m_applModul = m_applJob 

m_applModul.method1_from_appl_module 
m_applModul.method2_from_appl_module 


These methods (method1/_from_appl_module) are part of the interface loaded from interface_module and not part of the m_applJob-Object. Nevertheless, m_applModul now also supports all methods from the m_applJob-Object. 

So how can I do this in Python? 
I tried this, which didn't work: 

import win32com.client 
Obj_1 = win32com.client.Dispatch("Obj1_LIB.Impl_1") 
Obj_1.Init() 

ModulHelp = win32com.client.Dispatch("ModulHelper.Helper") 
applJob = win32com.client.Dispatch("ApplicationJob.Job") 

applJob._oleobj_.QueryInterface("{7DE9DB29-1794-4C3B-95EA-E1324B15BBE6}") ##using the uuid of the interface described in the IDL 

The error-message I receive is: 
Traceback (most recent call last): 
File "C:\PROGRA~1\python\lib\site-packages\Pythonwin\pywin\framework\scriptutils.py", line 310, in RunScript 
exec codeObject in __main__.__dict__ 
File "M:\Diagnose\Projekt EE61\ApplJob4test.py", line 655, in ? 
m_applJob=applJob._oleobj_.QueryInterface("{7DE9DB29-1794-4C3B-95EA-E1324B15BBE6}") 
com_error: (-2147467262, 'Schnittstelle nicht unterst\xfctzt', None, None) 

or, sometimes: 

Traceback (most recent call last): 
File "C:\PROGRA~1\python\lib\site-packages\Pythonwin\pywin\framework\scriptutils.py", line 310, in RunScript 
exec codeObject in __main__.__dict__ 
File "M:\Diagnose\Projekt EE61\ApplJob4test.py", line 655, in ? 
m_applJob=applJob._oleobj_.QueryInterface("{7DE9DB29-1794-4C3B-95EA-E1324B15BBE6}") 
TypeError: There is no interface object registered that supports this IID 

The second question is: 
How can I import data-types from a tlb to my python-code? Is that possible at all??? 

Thanks for your help on this!

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