Hi, In 2019, Yury Selivanov, who added HAMT and contextvars to Python, wrote PEP 603 "Adding a frozenmap type to collections": https://peps.python.org/pep-0603/
Sadly, the PEP was stuck in discussions: * https://discuss.python.org/t/pep-603-adding-a-frozenmap-type-to-collections/2318 * https://discuss.python.org/t/pep-603-frozenmap-vs-my-frozendict/2473 I don't think that differences between dict and frozenmap was a blocker issue. In fact, if I recall correctly, there was no blocker issue. Anyway, Yury is also maintaining the "immutables" 3rd party module which implements frozenmap: https://pypi.org/project/immutables/ Victor On Fri, Apr 1, 2022 at 11:37 AM 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 > _______________________________________________ > Python-Dev mailing list -- python-dev@python.org > To unsubscribe send an email to python-dev-le...@python.org > https://mail.python.org/mailman3/lists/python-dev.python.org/ > Message archived at > https://mail.python.org/archives/list/python-dev@python.org/message/2WYPX44WBFS2ZMZFNMDFMRPROB7G34JQ/ > Code of Conduct: http://python.org/psf/codeofconduct/ -- Night gathers, and now my watch begins. It shall not end until my death. _______________________________________________ Python-Dev mailing list -- python-dev@python.org To unsubscribe send an email to python-dev-le...@python.org https://mail.python.org/mailman3/lists/python-dev.python.org/ Message archived at https://mail.python.org/archives/list/python-dev@python.org/message/PQ42TTASV3ZOBJUTDHARTVTPY5EPIW57/ Code of Conduct: http://python.org/psf/codeofconduct/
