[Python-Dev] Pep 550 and None/masking

[Barry Warsaw]

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

-Barry

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