On Thu, Jun 6, 2019 at 4:15 AM Christoph Groth
wrote:
> Yonatan Zunger wrote:
>
> > I had a similar recent need, with a bit more on top of it, and solved it
> > with this slightly insane library. (Alas, I haven't figured out a good
> way
> > to make it act as a true subtype of UnderlyingType
Yury Selivanov wrote:
> On Thu, Jun 6, 2019 at 5:20 PM Christoph Groth
> wrote:
> [..]
> > The other possibility I see would be wrapping ContextVar inside a
> > class (like in the example module that I attached to the first post
> > in this thread), but that's not a good solution. It requires
>
On Thu, Jun 6, 2019 at 5:20 PM Christoph Groth wrote:
[..]
> The other possibility I see would be wrapping ContextVar inside a class
> (like in the example module that I attached to the first post in this
> thread), but that's not a good solution. It requires replicating the
> complete API, and
Yury Selivanov wrote:
> Christoph Groth wrote:
> > Did you consider anything like that? For example, ContextVar could
> > accept an optional keyword arg 'validate' that must be a function
> > that is then called for each new value, and somehow reports problems
> > (by return value or by raising
Yury Selivanov wrote:
> I suggest you to open an issue on bugs.python.org to implement support
> for context manager protocol for contextvars.Token. I'm not opposed
> to the idea. Keep in mind that Python 3.8 is already in a feature
> freeze mode, so the earliest we can get this is Python 3.9.
Yonatan Zunger wrote:
> I had a similar recent need, with a bit more on top of it, and solved it
> with this slightly insane library. (Alas, I haven't figured out a good way
> to make it act as a true subtype of UnderlyingType yet)
>
> (...)
To me, your trick seems to address a different
I had a similar recent need, with a bit more on top of it, and solved it
with this slightly insane library. (Alas, I haven't figured out a good way
to make it act as a true subtype of UnderlyingType yet)
import contextvars
from typing import Any, Generic, TypeVar
UnderlyingType =
On Wed, Jun 5, 2019 at 6:22 PM Christoph Groth wrote:
[..]
> I'm aware of this possibility, however it is not suitable for the use
> case that I have in mind (configuration variables), because it requires
> too much code for each variable.
>
> Of course one could wrap your example inside a
Hi Yury,
thanks for the quick reply.
Yury Selivanov wrote:
> Adding context manager protocol support to contextvars.Token was
> considered when PEP 567 was discussed. There wasn't a strong argument
> against that; however we decided not to immediately add it because
> context variables is a
Hi Christoph,
Adding context manager protocol support to contextvars.Token was
considered when PEP 567 was discussed. There wasn't a strong argument
against that; however we decided not to immediately add it because
context variables is a relatively low-level API. In you case, you can
simply
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