[Python-Dev] Add a frozendict builtin type (original) (raw)

Paul Moore p.f.moore at gmail.com
Tue Feb 28 13:13:52 CET 2012

On 28 February 2012 12:07, Mark Shannon <mark at hotpy.org> wrote:

frozendict helps also in threading and multiprocessing.

How so? Inter process/task communication requires copying. Inter/intra thread communication uses reference semantics. To ensure these are the same, the objects used in communication must be immutable.

Does that imply that in a frozendict, the values as well as the keys must be immutable?

Isn't that a pretty strong limitation (and hence, does it not make frozendicts a lot less useful than they might otherwise be)?

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