On Sat, 6 Mar 2021 at 07:52, Vincent Cheong <vincentcheong6...@gmail.com> wrote:
>
> So I thought, 'Why do we need to make a reversed copy to assign it to the
> original part, when we can simply reverse the original part itself.' That's
> the paradigm.
A few points strike me here:
1. The question you asked ("why do we need to") has an obvious and
trivial answer. "We don't need to". But so what? It's what we have,
and the status quo tends to win. If you're arguing for change, you
need to argue that the *cost* of that change is worth it, so you need
to be looking at what we will *gain*.
2. To put this another way, as far as this list is concerned, you're
phrasing the question backwards. Because backward compatibility and
availability of people for implementation and maintenance are real
costs for any proposal, the question that matters *here* is "Why do we
need partial-reverse to be a built in operation?"
3. If you're interested in the idea, you can, of course, implement it
and see how it works out. No-one is stopping you writing either an
extension that implements this, or a patch to Python. That's basically
the *whole point* of open source :-) And then, coming to this list
saying "I made this patch that implements in-place partial reversal of
lists, would it be worth submitting it as a PR?" would be a much
easier place to start from (because you're offering something that's
already eliminated some of those costs, as well as demonstrating that
you've looked at the practical aspects of the proposal).
Basically, even though this list is about "ideas", purely theoretical
"wouldn't it be nice if..." discussions don't tend to get very far (or
if they do, it's "far" in the sense of "way off-topic" :-)). A little
bit of work or thinking on the practical aspects of a proposal tends
to help a lot.
Paul
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