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Thu Sep 14 17:04:55 EDT 2017 · https://mail.python.org/pipermail/python-dev/2017-September/149561.html

On 14 September 2017 at 23:02, Ivan Levkivskyi <levkivskyi at gmail.com> wrote:

> On 14 September 2017 at 22:07, Ethan Furman <ethan at stoneleaf.us> wrote:
>
>> For comparison's sake, what would the above look like using __class__
>> assignment?  And what is the performance difference?
>>
>>
> FWIW I found a different solution:
>
> # file mod.py
>
> from typing_extensions import allow_forward_references
> allow_forward_references()
> from mod import Vertex, Edge  # the import is from this same module.
>
> It works both with __class__ assignment and with __getattr__
>
> --
> Ivan
>
>
Anyway, I don't think we should take this seriously, the way forward is PEP
563,
we should have clear separation between runtime context and type context.
In the latter
forward references are OK, but in the former, they are quite weird.

--
Ivan
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Showing content from https://mail.python.org/pipermail/python-dev/2017-September/149561.html below:

[Python-Dev] PEP 549: Instance Properties (aka: module properties)