[Python-Dev] Pep 550 and None/masking (original) (raw)

Guido van Rossum guido at python.org
Mon Aug 28 14:26:54 EDT 2017

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.

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