On Wed, 9 Aug 2017 08:38 pm, Marko Rauhamaa wrote: > sometimes you really would like an immutable > (or rather, no-longer-mutable) list to act as a key. There's a word for frozen list: "tuple". :-) -- Steve “Cheer up,” they said, “things could be worse.” So I cheered up, and sure enough, things got worse.