On Wed, Aug 5, 2020 at 5:55 PM Steven D'Aprano <st...@pearwood.info> wrote:
> On Wed, Aug 05, 2020 at 10:40:02PM +1200, Greg Ewing wrote:
>
> > A considerable number of moons ago, I suggested that
> >
> > @my_property
> > fred = 42
> >
> > should expand to
> >
> > fred = my_property("fred", 42)
>
>
> That require two different rules for decorators:
>
> @decorator over a `class name` or `def name` statement:
>
> - execute the statement
> - bind `name = decorator(name)`
>
But that's not what's done. (Proof: if the decorator raises, the name
remains unbound.)
> @decorator over a binding `target = expression`:
>
> - bind `target = decorator("target", expression)`
>
> So we're adding significant complexity to the concept of "decorator".
>
(That said, I'm not a fan of decorating assignments. The reason we invented
decorators in the first place doesn't apply here.)
--
--Guido van Rossum (python.org/~guido)
*Pronouns: he/him **(why is my pronoun here?)*
<http://feministing.com/2015/02/03/how-using-they-as-a-singular-pronoun-can-change-the-world/>
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