[Python-ideas] Quick idea: defining variables from functions that take the variable name

[Guido van Rossum]

On Mon, Jun 6, 2016 at 4:14 PM, Barry Warsaw <barry at python.org> wrote:

> On Jun 07, 2016, at 12:53 AM, M.-A. Lemburg wrote:
>
> >This would work as well and indeed reads better, but you'd need
> >to have the compiler generate:
> >
> >      x = obj
> >      recordbinding(obj, 'x', 2)
> >
> >ie. pass in the object, the bound name and the line number
> >and recordbinding would then have to decide what to do with the
> >parameters.
>
> +1 although I'd bikeshed on the order of the arguments.
>
> >I used the method variant, because a very common use case
> >is to let the object know about the name under which it is
> >now known to Python. This can be used to eg. define records,
> >forms, mappings, etc.
>
> Yep.  So given the above, `recordbinding(obj, 'x', 2)` would of course be
> free
> to delegate to `obj.recordbinding('x', 2)`, but it would be up to the
> decorator (and its author), not the compiler to do that delegation.
>
> >I just wonder how we could tell the compiler to special
> >case this decorator in a clean way.
>
> That's the rub, but I do think you're on to a good general solution to a
> common set of problems.
>

I think we're on to something here. Maybe. Perhaps.

-- 
--Guido van Rossum (python.org/~guido)
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