[Python-3000] Immutable lists (was: Re: Type annotations: annotating generators)

Guido van Rossum guido at python.org
Mon May 22 18:36:29 CEST 2006

On 5/22/06, Collin Winter <collinw at gmail.com> wrote:
> One thing I've run into several times in this process is the use of
> *args as a dict key. As several others have mentioned, the "tuple ==
> fixed-length, list == arbitrary-length" distinction means we now need
> a way to create hashable lists. I propose a new, hashable frozenlist
> built-in type to fill this niche.
> This type would subclass from list, overriding __getitem__,
> __delitem__, __hash__ and other methods as appropriate.
> Thoughts? Does this need to go through a full PEP process?

No, no, no!

--Guido van Rossum (home page: http://www.python.org/~guido/)

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