Hi, Steve. Thanks for your detailed explanation. Indeed I already saw the API discussion in PEP 603. It's much easier to make the decision in a third-party library. I think we will be fine with the immutables library.
On Fri, Apr 1, 2022 at 7:05 PM Steve Dower <steve.do...@python.org> wrote: > On 4/1/2022 11:48 AM, zhang kai wrote: > > 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. > > The main difference is that 'immutables' offers you a stable/versioned > interface to use it, while the one that's in CPython is an internal > implementation detail. If one day we find a better design, we can just > switch to it, while 'immutables' probably can't. If we've exposed as a > public interface in the core runtime, it's much more complicated. > > (For what it's worth, the major thing that held up contextvars in the > first place was justifying why it needed a new data structure that > wasn't already in the core runtime. So we didn't adopt it lightly, and > making sure we kept the freedom to change it was an important compromise.) > > There are plenty of other things in this same category, and because we > want to keep things as stable as possible while also improving > performance and reliability, we have to keep pretty tight limits on what > we promise will remain stable. Most of our discussions are about finding > this balance ;) > > Cheers, > Steve >
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