Interface implementation in python

Hi everybody,

I want to implement interface functionality in python. I wrote
following sample code

https://gist.github.com/1559689

Here I use an abc as an interface.
Couple of my models are implementing this interface and one of my
consumer model is using those models. In this implementation, I use my
abstract class to check if my models are implementing enough
functionality to make consumer model methods work (use_object method).

Since I used abc's here, I get an error as soon as I try to
instantiate a model object. (I do not need to invoke use_object method
for validation to work.)

Question 1) Is there a better way to implement this validation
functionality.
Question 2) In this implementation, Validation happens at object
instantiation time. Which means If I don't instantiate any object I
won't get any error, Is there a ( short ) way of getting this check on
code initialization? ( I am not dynamicly changing methods of my
models)

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