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eric__g's comment that the code ran fine for him in both terminal and notebook() suggested that the problem was in my system as opposed to being a bug in Sage.

I was going to unset PYTHONHOME, but first I ran the code again in notebook() and it ran without error. I am going to mark this question as solved as it is no longer reproducible.

I would give credit to eric__g, but don't see any way to do mark a comment as an answer.

It seems unlikely that running the code in terminal would change anything on my computer that would allow the code to subsequently run in notebook() without error. All I can say is that the code (one example is in my original post) now runs without error, while originally it did not.

Not much of an answer, but the best I can do, Bob.