Guido van Rossum wrote:
> Tuples are for heterogeneous data, list are for homogeneous data.
> Tuples are *not* read-only lists.
>
> Oh!
>
> Did you point that out anywhere, before, and I missed it?
>
> Yes. I've been saying this for years whenever people would listen
> (which is not often :-( )
Sorry.
>>Are you thinking of lists as to be really somehow
>>being homogeneous data, in a sense to be replacible
>>by some array optimization, sometimes, while tuples aren't?
>
>
> Python is a dynamic language, and you can do whatever you want with
> the data structures it gives you. But when thinking about extending
> the language with optional type declarations or automatic type
> inference, I always think of the type of a list as "list of T" while I
> think of a tuple's type as "tuple of length N with items of types T1,
> T2, T3, ..., TN". So [1, 2] and [1, 2, 3] are both "list of int" (and
> "list of Number" and "list of Object", of course) while ("hello", 42)
> is a "2-tuple with items str and int" and (42, "hello", 3.14) is a
> "3-tuple with items int, str, float".
Oh yes, after re-thinking this, my question was
dumb. From my own usage of tuples and lists,
I know that I almost always use lists as collections
of objects of the same type, while tuples are often
used to group different things together.
Basically, I knew this all, and I'm asking
myself why I asked. Probably since I'm looking
at lists and tuples too much technically, these days.
cheers - chris
--
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