On 16/01/2022 14:23, Marco Sulla wrote:
I think it could also be cool to create a literal frozenset this way:
a = fs{1, 2, 3}
or, why not, a frozenset comprehension:
a = fs{i+1 for i in range(3)}
Maybe too much?
+0.5
It would be nice for consistency (and perhaps performance). But you can
already say
a = frozenset({i+1 for i in range(3)})
which is not too bad.
On Sun, 16 Jan 2022 at 14:14, Rob Cliffe via Python-ideas
<python-ideas@python.org> wrote:
How about
fs{1, 2, 3}
?
Best wishes
Rob Cliffe
On 16/01/2022 12:41, Chris Angelico wrote:
> On Sun, Jan 16, 2022 at 11:18 PM Steven D'Aprano
<st...@pearwood.info> wrote:
>> On Sun, Jan 16, 2022 at 09:18:40PM +1100, Chris Angelico wrote:
>>
>>> While it's tempting, it does create an awkward distinction.
>>>
>>> f(1, 2, 3) # look up f, call it with parameters
>>> f[1, 2, 3] # look up f, subscript it with paramters
>>> f{1, 2, 3} # construct a frozenset
>> You forgot
>>
>> f"1, 2, {x+1}" # eval some code and construct a string
>>
>> Not to mention:
>>
>> r(1, 2, 3) # look up r, call it with parameters
>> r[1, 2, 3] # look up r, subscript it
>> r"1, 2, 3" # a string literal
> Strings behave differently in many many ways. Are there any
non-string
> types that differ?
>
>> Reading this makes my eyes bleed:
>>
>> >>> <1, 2, 3> < <1, 2, 3, 4>
>> True
> Fair point, but I can't imagine people comparing two literals like
> that. It's not quite as bad if you replace the left side with a
> variable or calculation, though it's still kinda weird.
>
>>> Unfortunately there aren't many symbols available, and
Python's kinda
>>> locked into a habit of using just one at each end (rather
than, say,
>>> (<1, 2, 3>) or something), so choices are quite limited.
>> Triple quoted strings say hello :-)
> See above, strings are different, and people treat them differently.
>
>> {{1, 2, 3}} would work, since that's currently a runtime error.
But I
>> prefer the f{} syntax.
>>
> Yeah, I think that ship has sailed. Double punctuation just isn't
> Python's thing, so there aren't really any good ways to shoehorn
more
> data types into fewer symbols.
>
> ChrisA
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