I'll let other people comment on this wrt Python (even though I think it looks cool and useful to me). Out of curiosity, why does frozenmap not have the same runtime and ordering guarantees as dict?
On Thursday, September 12, 2019 at 7:47:25 AM UTC-4, Yury Selivanov wrote: > > Hi! > > I've just published a PEP to add a frozenmap type to Python; it should > be online shortly. > > Read it here: > https://discuss.python.org/t/pep-603-adding-a-frozenmap-type-to-collections/2318 > > > 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 [0]_ 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. > > Yury > _______________________________________________ > Python-ideas mailing list -- python...@python.org <javascript:> > To unsubscribe send an email to python-id...@python.org <javascript:> > https://mail.python.org/mailman3/lists/python-ideas.python.org/ > Message archived at > https://mail.python.org/archives/list/python-ideas@python.org/message/HYFR6Q6UT54ESFVH5MWCSIX4IRFTEHBU/ > > Code of Conduct: http://python.org/psf/codeofconduct/ >
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