[Python-Dev] can't assign to function call

[Guido van Rossum]

Move. This. Thread. Out. Of. Python-Dev. Now. (python-ideas is the right place.)

On Mon, Mar 18, 2013 at 10:25 AM, Serhiy Storchaka <storchaka at gmail.com> wrote:
> On 18.03.13 17:40, Steven D'Aprano wrote:
>>
>> On 19/03/13 02:01, Hrvoje Niksic wrote:
>>>
>>> Assigning to function calls is orthogonal to reference types.  For
>>> example, Python manages assignment to subscripts without having
>>> references just fine:
>>>
>>> val = obj[index]      # val = obj.__getitem__(index)
>>> obj[index] = val      # obj.__setitem__(index, val)
>>>
>>> In analogy with that, Python could implement what looks like
>>> assignment to function call like this:
>>>
>>> val = f(arg)          # val = f.__call__(arg)
>>> f(arg) = val          # f.__setcall__(arg, val)
>>
>>
>> That's all very well, but what would it do? It's not enough to say that
>> the syntax could exist, we also need to have semantics. What's the
>> use-case here? (That question is mostly aimed at the original poster.)
>
>
> Python could use parenthesis instead of brackets for indexing and a
> dictionary lookup. However it is too late to discuss this idea.
>
>
>
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--
--Guido van Rossum (python.org/~guido)