[Python-Dev] PEP 567 v2

[Yury Selivanov]

On Wed, Jan 3, 2018 at 3:04 AM Victor Stinner <victor.stinner at gmail.com>
wrote:

> What is the behaviour of ContextVar.reset(token) if the token was created
> from a different variable? Raise an exception?
>
> token = var1.set("value")
> var2.reset(token)
>
> The PEP states that Token.var only exists for debug or introspection.
>

It will raise an error. I'll specify this in the PEP.

Yury


> Victor
>
>
> Le 3 janv. 2018 00:51, "Victor Stinner" <victor.stinner at gmail.com> a
> écrit :
>
> Why ContextVar.reset(token) does nothing at the second call with the same
> token? What is the purpose of Token._used? I guess that there is an use
> case to justify this behaviour.
>
> reset() should have a result: true if the variable was restored to its
> previous state, false if reset() did nothing because the token was already
> used. And/Or Token should have a read-only "used" property.
>
> Victor
>
>
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