Faster decompression in CPython 3.15

• PEP 814 – Add frozendict built-in type
• From Material for MkDocs to Zensical
• Tach
• Some Python Speedups in 3.15 and 3.16
• Extras
• Joke

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Michael #0: Black Friday is on at Talk Python

• What’s on offer:
  1. An AI course mini bundle (22% off)
  2. 20% off our entire library via the Everything Bundle (what's that? ;) )
  3. The new Talk Python in Production book (25% off)

Brian: This is peer pressure in action

• 20% off The Complete pytest Course bundle (use code BLACKFRIDAY) through November
  • or use save50 for 50% off, your choice.
• Python Testing with pytest, 2nd edition, eBook (50% off with code save50) also through November
  • I would have picked 20%, but it’s a PragProg wide thing

Michael #1: PEP 814 – Add frozendict built-in type

• by Victor Stinner & Donghee Na
• A new public immutable type frozendict is added to the builtins module.
• We expect frozendict to be safe by design, as it prevents any unintended modifications. This addition benefits not only CPython’s standard library, but also third-party maintainers who can take advantage of a reliable, immutable dictionary type.
• To add to existing frozen types in Python.

Brian #2: From Material for MkDocs to Zensical

• Suggested by John Hagen
• A lot of people, me included, use Material for MkDocs as our MkDocs theme for both personal and professional projects, and in-house docs.
• This plugin for MkDocs is now in maintenance mode
• The development team is switching to working on Zensical, a static site generator to overcome some technical limitations with MkDocs. There’s a series of posts about the transition and reasoning
  1. Transforming Material for MkDocs
  2. Zensical – A modern static site generator built by the creators of Material for MkDocs
  3. Material for MkDocs Insiders – Now free for everyone
  4. Goodbye, GitHub Discussions
• Material for MkDocs
  • still around, but in maintenance mode
  • all insider features now available to everyone
• Zensical is / will be
  • compatible with Material for Mkdocs, can natively read mkdocs.yml, to assist with the transition
  • Open Source, MIT license
  • funded by an offering for professional users: Zensical Spark

Michael #3: Tach

• Keep the streak: pip deps with uv + tach
• From Gerben Decker
• We needed some more control over linting our dependency structure, both internal and external.
• We use tach (which you covered before IIRC), but also some home built linting rules for our specific structure. These are extremely easy to build using an underused feature of ruff: "uv run ruff analyze graph --python python_exe_path .".
• Example from an app I’m working on (shhhhh not yet announced!)

Brian #4: Some Python Speedups in 3.15 and 3.16

• A Plan for 5-10%* Faster Free-Threaded JIT by Python 3.16
  • 5% faster by 3.15 and 10% faster by 3.16
• Decompression is up to 30% faster in CPython 3.15

Extras

Brian:

• LeanTDD book issue tracker

Michael:

• No. 4 for dependencies: Inverted dep trees from Bob Belderbos

Joke: git pull inception