Thanks Victor and Pablo. I will check the discussion of PEP 603. It's a
little weird to use the immutables library when it's code in already in
CPython but I'm glad it's an option.

Kai

On Fri, Apr 1, 2022 at 6:14 PM Pablo Galindo Salgado <pablog...@gmail.com>
wrote:

> You may want to check PEP 603, which more or less proposes this (the
> author of the pep is the author of the HAMT code)
>  check https://peps.python.org/pep-0603/
>
> Alternatively, there is already a pypi package with this code:
>
> https://pypi.org/project/immutables/
>
> Regards from cloudy London,
> Pablo
>
> On Fri, 1 Apr 2022, 10:34 zhang kai, <kylerzhan...@gmail.com> wrote:
>
>> Hi,
>>
>> HAMT is a very useful immutable mapping type. Currently CPython use it
>> internally to implement contextvar. Considering immutable data structure is
>> very useful I hope we can make it available to python script(maybe via
>> collections module).
>>
>> Immutable data structures are fundamental parts of our project. Currently
>> we use a full-featured python immutable data library called pyrsistent.
>> Pyrsistent is very powerful, however the map type in it is implemented in
>> python script not in C. It becomes slow when the data set is relatively
>> large.
>>
>> On the other hand, CPython now already has an immutable mapping type in
>> it. I think maybe it’s a good idea to make it public? Many projects can
>> benefit from it I believe.
>>
>> Here is a talk given by the author of javascript immutable-js library
>> explain why immutable data structures are powerful:
>> https://www.youtube.com/watch?v=I7IdS-PbEgI
>>
>> Pyristent: https://github.com/tobgu/pyrsistent
>>
>> What do you think?
>>
>> Cheers,
>> Kai
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