On 28 February 2017 at 23:19, Victor Stinner <victor.stinner@gmail.com> wrote:

2017-02-28 13:17 GMT+01:00 Michel Desmoulin <desmoulinmichel@gmail.com>:
> We have the immutable frozenset for sets and and tuples for lists.
>
> But we also have something to manipulate dict as immutable datastructures:

... Sorry, I don't understand your proposition.

My interpretation of the idea is to reconsider https://www.python.org/dev/peps/pep-0416/

but put frozendict in collections, not in builtins.

MappingProxyType could be a possible implementation
(plus copying in constructor and hashing, as proposed above by Matt),

but not necessarily.

--

Ivan