Thanks to both Ethan and Steven for their replies. Steven: I was trying to use the interpreter and wasn't getting results that I understood -- because I didn't know that __getslice__ was simply gone in Python 3. I implemented a __getslice__ method in my subclass that never got called.
Ethan: I saw that slice objects were being sent to __getitem__, but that confused me as I thought that its purpose, as implied by the method name, was to return a SINGLE item. OK, I think that I've got all that sorted out! -- https://mail.python.org/mailman/listinfo/python-list
