> I think you could check to see if it is an instance of Expect (from 
sage/interfaces/expect.py).

I'm confused now.  What should be in Sets, and what shouldn't?

Concerning the original question: do you really want to use the category 
Sets?  For example:

sage: W = Words([0,1], 3)
sage: W in Sets()
True

sage: Posets(5) in Sets()
True

sage: crystals.Letters(("A", 4)) in Sets()
True


Martin

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