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[Python-Dev] Dataclasses, frozen and __post_init__

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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

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