Oleksandr

Accessing global variables will be as fast as locals in Python 3.8. I researched and prototyped the approach before 3.7 but didn't have time to finish the work. Huge thanks to @methane for pushing this through. 🚀🚀🚀 github.com/python/cpython/pu…

Let's talk about immutability. Python, unlike languages like Clojure, Erlang, and Rust is built entirely around mutable state. I'm going to try to convince you that immutability is awesome and can be effectively used in Python today. Thread 👇

11. The implementation of that new mapping type is rather complex, and it would be a shame if we could only use it for contextvars and nothing else. So we created a new library out of it: immutables. github.com/magicstack/immuta… – at Toronto, Ontario

12. With immutables.Map you can easily create immutable and hashable mappings. The Map type is almost as fast as Python dict, with O(log32 N) lookup/update complexity. Maybe we'll have it in Python 3.8 stdlib! – at Toronto, Ontario

I've just released immutables 0.7 -- a high-performance immutable mapping type for Python. New features: Maps now have an efficient bulk-mutation API, can be created from other mappings, and can be pickled. github.com/MagicStack/immuta…