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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