[Python-Dev] List vs Tuple / Homogeneous vs Heterogeneous / Mutable vs Immutable

[Chris Angelico]

On Thu, Apr 24, 2014 at 1:59 PM, Łukasz Langa <lukasz at langa.pl> wrote:
> On Apr 17, 2014, at 11:49 AM, Brett Cannon <bcannon at gmail.com> wrote:
>
>> Think of tuples like a struct in C, lists like an array.
>
>
> I generally agree but it’s a bit more complex, for instance when you have a
> homogenous sequence but want it to be hashable. I just hit that today and
> felt a little bad using tuple because of that “struct” mindset :)

All you need is a "frozenlist" type, parallel to "frozenset":

frozenlist = tuple # Magic!

some_dict[frozenlist([...])] = some_value

ChrisA