Python 3.13.0 Is Released

1. CPython

   1 1,471 65,684 10.0 Python

   The Python programming language

   

   > It’s doing hash table lookups per variable access.

   That hasn't been true for many variable accesses for a very long time. LOAD_FAST, LOAD_CONST, and (sometimes) LOAD_DEREF provide references to variables via pointer offset + chasing, often with caches in front to reduce struct instantiations as well. No hashing is performed. Those access mechanisms account for the vast majority (in my experience; feel free to check by "dis"ing code yourself) of Python code that isn't using locals()/globals()/eval()/exec() tricks. The remaining small minority I've seen is doing weird rebinding/shadowing stuff with e.g. closures and prebound exception captures.

   https://github.com/python/cpython/blob/10094a533a947b72d01ed...

   https://github.com/python/cpython/blob/10094a533a947b72d01ed...

   So too for object field accesses; slotted classes significantly improve field lookup cost, though unlike LOAD_FAST users have to explicitly opt into slotting.

   Don't get me wrong, there are some pretty regrettably ordinary behaviors that Python makes much slower than they need to be (per-binding method refcounting comes to mind, though I hear that's going to be improved). But the old saw of "everything is a dict in python, even variable lookups use hashing!" has been incorrect for years.

2. CodeRabbit

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3. docker-pyenv

   2 1 2 -

   Dockerfile with Automated Builds that has pyenv built in for easy versioning of Python! :)

4. pyright

   3 144 13,979 9.9 Python

   Static Type Checker for Python

   

   disclaimer: I don't work on big codebases.

   Pylance with pyright[0] while developing (with strict mode) and mypy[1] with pre-commit and CI.

   Previously, I had to rely on pyright in pre-commit and CI for a while because mypy didn’t support PEP 695 until its 1.11 release in July.

   [0] -- https://github.com/microsoft/pyright

   [1] -- https://github.com/python/mypy

5. mypy

   4 121 19,058 9.8 Python

   Optional static typing for Python

   

   disclaimer: I don't work on big codebases.

   Pylance with pyright[0] while developing (with strict mode) and mypy[1] with pre-commit and CI.

   Previously, I had to rely on pyright in pre-commit and CI for a while because mypy didn’t support PEP 695 until its 1.11 release in July.

   [0] -- https://github.com/microsoft/pyright

   [1] -- https://github.com/python/mypy

6. ruff

   5 114 36,665 10.0 Rust

   An extremely fast Python linter and code formatter, written in Rust.

   

   I agree, it's unreasonable to expect devs to know the whole standard library. The VSCode extension Pylance does give a warning when this happens. I thought linters might also check this. The one I use doesn't, maybe the issue[0] I just created will lead to it being implemented.

   [0]: https://github.com/astral-sh/ruff/issues/13676

7. SaaSHub

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