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

[Greg Ewing]

Collin Winter wrote:

> In Python 2, sure, but if Python 3 introduces the idea that tuples
> should be used for fixed-length structures (since Guido has said that
> tuple[Number, Number] should be a 2-tuple of Numbers), then something
> else needs to fill the "hashable, arbitrary-length ordered container"
> niche.

The way to resolve this is to devise a notation for
arbitrary-length tuple types, not to introduce a whole
new data type and revise everyone's ideas on how a
tuple should be used. As far as I'm aware, Guido has
never said that tuples should *only* be used for
fixed-length applications.

--
Greg