Paul Ganssle @pganssle@qoto.org

Here's a typing puzzle: https://mypy-play.net/?mypy=latest&python=3.11&flags=strict&gist=6baf24cc7bc82ac6e8f9995d361f682e

I want to have a method decorator that constrains the type of `self` with respect to a generic, but (obviously) does not _reduce_ the type of `self` to require that it accept any instance of the bound the decorator requires. Do I just need higher-kinded TypeVars for this (https://github.com/python/typing/issues/548) or am I missing something obvious?

It still feels like magic to me that #NumPy allows slices that aren't "rectangular". They can be arbitrary index lists, which in the simplest form allows you to "draw" polygons by first selecting the pixels and then making a single assignment. That's what ski.draw.polygon does.

But it goes further, you can have really arbitrary lists of multi-dimensional indexes so they don't have to be continuous or anything. My simple high-school math mind can barely accept it 🤯

#Python

NumPy 2.0 is coming. You should be excited and terrified in equal measure.

- Stan Siebert at #SciPy2023

Wow. Meta commits to dedicate three engineer-years to implement the removal of the GIL from #Python and fix upcoming compatibility and performance issues with it.

All this dependent on whether the Steering Council accepts PEP 703.

https://discuss.python.org/t/a-fast-free-threading-python/27903/99?u=ambv

Need to work with timezones in #Python?

Don't use pytz! Use zoneinfo.

It's included in the Python standard library from Python 3.9 onward and pip install-able if you're on Python 3.8.

If your code needs to run on Windows, note that you'll need to pip install tzdata to use Python's zoneinfo module properly.

If you're really curious to understand this topic deeply, watch @pganssle's talk from @pycon: https://m.youtube.com/watch?v=rYzgroaK8_Q&feature=youtu.be

The scope of a feature request often isn't obvious to the asker. For example, someone just asked on the Python forum to make it possible to subclass `pathlib.Path.` Meanwhile, Barney Gale has spent the last *three years* or so working on all the nuances of that, and it's finally making it into Python 3.12 although there's more to do. He worked so much they made him a core dev. #Python #TodayInOpenSource

Once again, I am so frustrated by Python static typing https://github.com/pallets/click/issues/2558 If any typing expert out there wants to help, that would be wonderful. #Python

I'm on the job market. Any early stage startups hiring lead engineer positions, DM me please! 🙂

This weekend I’ve spent more time in the tox rabbit hole than I expected, but check out how I’ve cut the runtime of full tox runs of the attrs test suite by 75%:

Two Ways to Turbo-Charge tox
https://hynek.me/articles/turbo-charge-tox/

Twitter is falling apart. Reddit is falling apart. Facebook fell apart ages ago. Meta is a trashfire. Instagram is baloney. Google can't even search for anything you want anymore.

You know what website still miraculously works?

Wikipedia.

You should donate to keep it that way.

wow TIL that as of #tox 4, you can absolutely SLAY the environment build times if your project builds universal wheels (= virtually all pure-#Python ones)

Just add

```
[testenv]
package = wheel
wheel_build_env = .pkg
```

and it won’t build your package for every Python version anew: https://tox.wiki/en/latest/upgrading.html#universal-wheels

For my service-identity which has a very quick test suite but a lot of factor combinations, it’s 3m vs 30s. structlog that has fewer but slower envs is still 2:35 vs 1:47.

Calling all #Python library maintainers! 🐍

Python 3.12 is in beta! 🎉

This means no new features are allowed in and it's now time to start testing your code. You might find things in your code to fix, or even better, you might find things to fix in Python itself!

Here's how to do it:

https://dev.to/hugovk/help-test-python-312-beta-1508 #python312 #beta #test #CI #GitHubActions

req for suggestions to my limited following 😅 anyone know of any tools/services for capturing user feedback on CLI tools e.g. “try out this new feature: do the prompts make sense? do the commands make sense for the task(s) we're asking you to do?”

`git log -S some_variable_name` returns all commits where `some_variable_name` is in the diff (either removed, added, or modified)

super useful for tracking down regressions where you know the variable that's the culprit