I think Nils' original solution, of adding an immutable keyword option to
the parent, is a good one. I've run into a similar issue with matrices,
where I had to make them immutable before using them as dictionary keys.
David
On Fri, Aug 6, 2021 at 7:39 PM Nils Bruin <nbr...@sfu.ca> wrote:
> On Friday, 6 August 2021 at 16:31:23 UTC-7 wst...@gmail.com wrote:
>
>> To clarify, by "similar reasons to numpy", I meant that you open up
>> the possibility of using Cython, vectorized operations, JITs like
>> numba, etc. Some of these provide order of magnitude speedups and
>> aren't an option with generic Python lists.
>
>
> To clarify, this thread certainly didn't start out with the question if
> sage should have mutable vectors at all (although I do think that in most
> cases, an array would then work just as well). I think it is worth
> reconsidering whether all vectors need to start out their life being
> mutable, because that does come with a significant usability penalty in
> hash-related scenarios.
>
> It is indeed the case that we could just spell these examples as
> {tuple(v+w): ... }, and probably that is what cached_function argument
> manglers do, but .... to me that just looks super ugly (and the annoying
> part is that it'll take me a error for every time I need to insert that).
>
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