Topics covered in this episode: Solara UI FrameworkCoverage at a crossroads“Virtual” methods in Python classesExtrasJokeExtrasJokeWatch on YouTube About the show Sponsored by ScoutAPM: pythonbytes.fm/scout Connect with the hosts Michael: @mkennedy@fosstodon.orgBrian: @brianokken@fosstodon.orgShow: @pythonbytes@fosstodon.org Join us on YouTube at pythonbytes.fm/live to be part of the audience. Usually Tuesdays at 10am PT. Older video versions available there too. Finally, if you want an artisanal, hand-crafted digest of every week of the show notes in email form? Add your name and email to our friends of the show list, we'll never share it. Michael #1: Solara UI Framework via FlorianA Pure Python, React-style Framework for Scaling Your Jupyter and Web AppsSolara lets you build web apps from pure Python using ipywidgets or a React-like API on top of ipywidgets. These apps work both inside the Jupyter Notebook and as standalone web apps with frameworks like FastAPI.See the Examples page.Based on ReactonBy building on top of ipywidgets, Solara automatically leverage an existing ecosystem of widgets and run on many platforms, including JupyterLab, Jupyter Notebook, Voilà, Google Colab, DataBricks, JetBrains Datalore, and more. Brian #2: Coverage at a crossroads Ned Batchelder is working on making coverage.py faster.Includes a nice, quick explanation of roughly how coverage.py works with trace function and arcs used for branch coverage.And how trace slows things down for lines we know are already covered.There are cool ideas from SlipCover that could be applicable.There’s also sys.monitoring from Python 3.12 that helps with line coverage, since you can disable it for lines you already have info on. It doesn’t quite complete the picture for branch coverage, though. Summary: jump in and help if you canread it anyway for a great mental model of how coverage.py works. Michael #3: “Virtual” methods in Python classes via Brian SkinnPEP 698 just got accepted, defining an @override decorator for type hinting, to help avoid errors in subclasses that override methods.Only affects type checkers but allows you to declare a “link” between the base method and derived class method with the intent of overriding it using OOP. If there is a mismatch, it’s an error.Python 3.12’s documentationMakes Python a bit more like C# and other more formal languages Brian #4: Parsing Python ASTs 20x Faster with Rust Evan DoyleTach is “a CLI tool that lets you define and enforce import boundaries between Python modules in your project.” we covered it in episode 384When used to analyze Sentry’s ~3k Python file codebase, it took about 10 seconds. Profiling analysis using py-spy and speedscope pointed to a function that spends about 2/3 of the time parsing the AST, and about 1/3 traversing it.That portion was then rewritten in Rust, resulting in 10x speedup, ending in about 1 second.This is a cool example of not just throwing Rust at a speed problem right away, but doing the profiling homework first, and focusing the Rust rewrite on the bottleneck. Extras Brian: I brought up pkgutil.resolve_name() last week on episode 388 Brett Cannon says don’t use that, it’s deprecatedThanks astroboy for letting me knowWill we get CalVer for Python? it was talked about at the language summitThere’s also pep 2026, in draft, with a nice nod in the number of when it might happen. 3.13 already in the works for 20243.14 slated for 2025, and we gotta have a pi releaseSo the earliest is then 2026, with maybe a 3.26 version ?Saying thanks to open source maintainers Great write-up by Brett Cannon about how to show your appreciation for OSS maintainers. Be niceBe an advocateProduce your own open sourceSay thanksFiscal supportOn topic Thanks Brett for pyproject.toml. I love it. Michael: The Shiny for Python course is out! Plus, it’s free so come and get it. Joke: Tao of Programming: Book 1: Into the Silent Void, Part 1
Show more
Show less
Jul 17 202426 mins