On Fri, Jan 21, 2022 at 3:52 AM Oscar Benjamin <[email protected]>
wrote:
> > If this does all come to pass, then:
>>> >
>>> > s = {3,8,2}.frozen()
>>> > will be slightly faster, in some case, than
>>> > s = frozenset({3,8,2}
>>> >
>>> > but the result would be the same.
>>>
>>> I really don't understand (having read everything above) why anyone
> prefers {1,2,3}.frozen() over f{1,2,3}.
>
Because it doesn't require any change to the language -- it's a feature,
not a language change. Every change to the language is s substantial burden
to the whole community. Even a "small" one like this.
It was absolutely worth for, e.g. f-strings, because they are a
feature that has very broad use. This would have narrow use, and, I think
even the OP said is more about potential optimization than a nicer syntax.
If others think this syntax is substantially nicer, sure -- but then I'd
argue that frozensets are simply not that commonly used -- you yourself
realized that while you have an important use case, you aren't using
literals that often anyway (at all?).
Python is not a high-performance language -- has it ever had a feature
added primirly so it could be optimized? (that is a serious question).
And this does seem like a very small change, but is it?
1) folks, a couple years from now, reading new code might have never heard
of a frozenset, and see:
frozenset(something)
or
{1,5,2}.frozen()
will probably have a pretty good idea what those mean, and if they have no
clue, then it's easy to look up.
f{3,1,6}
not so much.
And once we have ONE prefix on a bracket, I"ll bet you folks will suggest
more ...
small change
medium churn
tiny benefit
(frankly, it's confusing enough that {a,b,c} makes a set and {} makes a
dict, but what can we do? there's only so many brackets :-(
-CHB
--
Christopher Barker, PhD (Chris)
Python Language Consulting
- Teaching
- Scientific Software Development
- Desktop GUI and Web Development
- wxPython, numpy, scipy, Cython
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