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Tue Feb 28 12:53:27 CET 2012 · https://mail.python.org/pipermail/python-dev/2012-February/117040.html

On Tue, 28 Feb 2012 12:45:54 +0100
Victor Stinner <victor.stinner at haypocalc.com> wrote:
> > I think you need to elaborate on your use cases further, ...
> 
> A frozendict can be used as a member of a set or as a key in a dictionary.
> 
> For example, frozendict is indirectly needed when you want to use an
> object as a key of a dict, whereas one attribute of this object is a
> dict.

It isn't. You just have to define __hash__ correctly.

> frozendict helps also in threading and multiprocessing.

How so?

Regards

Antoine.

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[Python-Dev] Add a frozendict builtin type