[Python-Dev] Add a frozendict builtin type

[Antoine Pitrou]

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.