[Python-Dev] Pep 550 and None/masking

[Guido van Rossum]

On Mon, Aug 28, 2017 at 9:26 AM, Barry Warsaw <barry at python.org> wrote:

> On Aug 28, 2017, at 11:50, Yury Selivanov <yselivanov.ml at gmail.com> wrote:
>
> > For checking if a context variable has a value in the topmost LC, we
> > can add two new keyword arguments to the "ContextVar.lookup()" method:
> >
> >   ContextVar.lookup(*, default=None, topmost=False)
> >
> > If `topmost` is set to `True`, `lookup` will only check the topmost LC.
> >
> > For deleting a value from the topmost LC we can add a new
> > "ContextVar.delete()" method.
>
> +1
>
Yes, that's the only way. (Also forgive me for ever having proposed
lookup() -- I think we should go back to get(), set(), delete(). Things
will then be similar to getattr/setattr/delattr for class attributes.

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