frozendict

[Evan Driscoll]

Hi all,

I've been trying for a few days (only a little bit at a time) to come up
with a way of implementing a frozendict that doesn't suck. I'm gradually
converging to a solution, but I can't help but think that there's some
subtlety that I'm probably missing which is why it's not already provided.

Does anyone know why Python doesn't already come with a frozendict, or
why there seem to only be a couple attempts to write one?

Evan



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[Steven D'Aprano]

Hi all,

I've been trying for a few days (only a little bit at a time) to come up
with a way of implementing a frozendict that doesn't suck. I'm gradually
converging to a solution, but I can't help but think that there's some
subtlety that I'm probably missing which is why it's not already
provided.

Does anyone know why Python doesn't already come with a frozendict, or
why there seem to only be a couple attempts to write one?

Because there is no way to implement one that doesn't suck?

Because it's a solution in search of a problem?

<shrug>

Actually, that's unfair. A write-once dict would be awesome for providing
read-only constants, if only there were some way to set a namespace to
using non-builtin dicts.