Not really. I can't even think of an obvious example where it would be
useful...
>
> (2) would you accept the performance penalty of always deep copying
> lists used as keys? (2a) when using lists (2b) when not using
> lists!
One of the biggest advantages of using dictionaries is the efficiency
of search (hash tables, etc...). So, I would say no at least in case (2b).
>
> (3) do you happen to have another implementation idea?
Unfortunately, I must throw another "no" in here...
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Jose' Pereira
INESC (Inst. Eng. Sistemas e Computadores)
R. Alves Redol 9, 6. 1000 Lisboa, PORTUGAL.
Phone.: +351 1 3100225 Fax...: +351 1 525843
e-mail: jmp@inesc.pt PSI...: %(0268)004010314::inesc::jmp