BTW, I forget to mention, but please post replies here: https://discuss.python.org/t/pep-603-adding-a-frozenmap-type-to-collections/...
I'm checking this mailing list on a far less regular schedule. Besides, splitting the discussion between two different mediums isn't a good idea anyways.
On Thu, Sep 12, 2019 at 12:46 PM Yury Selivanov firstname.lastname@example.org wrote:
I've just published a PEP to add a frozenmap type to Python; it should be online shortly.
Here's an excerpt from the Abstract:
A *persistent data structure* is defined as a data structure that preserves the previous version of the data when the data is modified. Such data structures are effectively *immutable*, as operations on them do not update the structure in-place, but instead always yield a new updated structure (see _ for more details.)
This PEP proposes to add a new fully persistent and immutable mapping type called ``frozenmap`` to the ``collections`` module.
The bulk of ``frozenmap``'s reference implementation is already used in CPython to implement the ``contextvars`` module.