[Python-Dev] Pep 550 and None/masking

[Nathaniel Smith]

I believe that the current status is:

- assigning None isn't treated specially – it does mask any underlying
values (which I think is what we want)

- there is currently no way to "unmask"

- but it's generally agreed that there should be a way to do that, at least
in some cases, to handle the save/restore issue I raised. It's just that
Yury & Elvis wanted to deal with restructuring the PEP first before doing
more work on the api details.

-n

On Aug 27, 2017 9:08 AM, "Jim J. Jewett" <jimjjewett at gmail.com> wrote:

> Does setting an ImplicitScopeVar to None set the value to None, or just
> remove it?
>
> If it removes it, does that effectively unmask a previously masked value?
>
> If it really sets to None, then is there a way to explicitly unmask
> previously masked values?
>
> Perhaps the initial constructor should require an initial value
>  (defaulting to None) and the docs should give examples both for using a
> sensible default value and for using a special "unset" marker.
>
> -jJ
>
>
>
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