[Python-Dev] Dataclasses, frozen and __post_init__

[Chris Barker - NOAA Federal]

But how?


Well, I hadn’t thought that far ;-)

But it would make frozen an instance level property, rather than a
class-level one — some instances would be frozen, some not.

Which would be kinda compatible with the idea of hashability being a
property of values, rather than type. Frozen-ness would also be a property
of values.

But it would require a flag, and a bunch of logic overhead, which could get
pretty ugly so maybe not worth it.

-CHB



On Mon, Feb 19, 2018 at 5:06 PM, Chris Barker - NOAA Federal <
chris.barker at noaa.gov> wrote:

> If I have this right, on the discussion about frozen and hash, a use
> case was brought up for taking a few steps to create an instance (and
> thus wanting it not frozen) and then wanting it hashable.
>
> Which pointed to the idea of a “ freeze this from now on” method.
>
> This seems another use case — maybe it would be helpful to be able to
> freeze an instance after creation for multiple use-cases?
>
> -CHB
>



-- 
--Guido van Rossum (python.org/~guido)
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