Phillip B Oldham <[email protected]> wrote:
> On Jul 20, 6:08 pm, Duncan Booth <[email protected]> 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'
--
http://mail.python.org/mailman/listinfo/python-list
