Phillip B Oldham <phillip.old...@gmail.com> wrote:
> On Jul 20, 6:08 pm, Duncan Booth <duncan.bo...@invalid.invalid> wrote:
>> The main reason why you need both lists and tuples is that because a
>> tuple of immutable objects is itself immutable you can use it as a
>> dictionary key.
>
> Really? That sounds interesting, although I can't think of any real-
> world cases where you'd use something like that.
>
How about a multi-dimensional sparse array?
>>> d = {}
>>> d[1,2] = 'a'
>>> d[5,7] = 'b'
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