I believe that one of the most popular Python domains that benefit from
"abusing" indexes is data analysis in the numpy/Pandas world.
I am not familiar enough with Pandas to make useful speculation on how
named indexes could enhance the usage of dataframes, - maybe someone more
familiar can come up with suggestions on how this syntax could be useful?
On Fri, 10 Jul 2020 at 09:24, Ricky Teachey <ri...@teachey.org> wrote:
>
>
> On Fri, Jul 10, 2020, 6:54 AM Jonathan Fine <jfine2...@gmail.com> wrote:
>
>> Hi All
>>
>> SUMMARY
>> This is a longish post. It looks at the idea in general terms, and
>> outlines a way to get the desired semantics (by not syntax) with Python as
>> it is today. And this would be forward compatible with the new syntax, if
>> provided later.
>>
>
> This post was filled with inspiring ideas for me. Thank you.
>
>
>> PRESENT
>> I like the idea of allowing
>> >>> d[1, 2, 3, a=4, b=5]
>> and will explore it further.
>>
>> First, we can already write
>> >>> f(1, 2, 3, a=4, b=5)
>> but that only works for the get operation. For set the present behaviour
>> is
>> >>> f(1, 2, 3, a=4, b=5) = None
>> SyntaxError: can't assign to function call
>> and I see no good reason to change that.
>>
>> Going further, I'd say that allowing both
>> >>> d[something] = value
>> >>> value = d[something]
>> is essential to the difference between f(something) and d[something].
>> Both are expressions, but only one of them can be assigned to.
>>
>
>
>> Here goes. First syntax.
>> >>> value = d[K(1, 2, 3, a=4, b=5)]
>> >>> d[K(1, 2, 3, a=4, b=5)] = value
>>
>
>
> My mind instantly went to the idea of using this syntax as a way write
> single line mathematical function definitions:
>
> f[x, y] = x + y
>
> The example function doesn't even require the suggested K() object since
> no kwargs or defaults are used.
>
> Of course one would need to instantiate any these single line functions
> using a little bit of boilerplate up top. But this could be when you
> provide the docstring:
>
> f = MathFunction("Simple math function")
> f[x, y] = x + y
>
> And calling them would use a different bracket type (parentheses):
>
> >>> f(1,2)
> 3
>
> ...but these are surmountable hurdles.
>
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