[comtypes-users] How to implement COM interface properly

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Hi there,

I'm relatively new to COM and have recently discovered comtypes (this lib is
GREAT! Thanks!).  I've got a lot of things working so far, but I'm stuck on
trying to create an implementation of a COM interface object.  I think my
issue is basic and straight forward, but so far no luck with whatever
examples I could find.  Maybe because I'm still a COM newb :)

Basically I have an interface "ISomeInterface" and I need to create an
implementation of this interface to pass it as a parameter to another COM
call.  In the generated comtypes .py file, I see it actually creates a code
stub for you that looks like this:

class ISomeInterface_Impl(object):
 def blah(self):
   '-no docstring-'
   #return

It sounds like this is exactly what I'd like to do.  Define the _Impl,
create it, override methods as needed, but some things don't make sense to
me.
1) Why is it extending object?  Shouldn't it extend ISomeInterface ?
2) I've seen in some posts that _com_interfaces_ needs to be defined
3) In other posts, I've also seen COMObject extended instead of object

I've tried a lot of different permutations, but it seems I'm unable properly
pass the object as a parameter to another COM call that expects
ISomeInterface implementation as a parameter.  Does anyone have examples of
implementing a COM interface?  Or know what I might be missing?

Any help or suggestions would be greatly appreciated!  I hope I've put
enough detail into my question.

Cheers!
Eddie