#448 I'm Getting the BIOS Flavor

Sep 8, 2025

Discover the innovative tool, prek, a Rust alternative to pre-commit that boosts efficiency without the hassle of Python installations. Explore TinyIO, a lightweight async approach simplifying concurrency in Python. Dive into the power of Python's print function and the crucial responsibility developers have when using AI. Laugh along as the hosts discuss a major AI settlement and the humorous mishaps that come with tech. And don't miss their playful banter on Slurpee flavors and the quirks of AI communication!

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ADVICE

Try Prek For Faster Pre-Commit Workflows

Try prek (pre-commit reimplemented in Rust) to speed up installs and CI runs and reduce cache size.
Use prek's new flags like --directory, --last-commit, and prek list to simplify hook selection and workflows.

INSIGHT

Rust Shines For File-Parsing Hooks

Rewriting common file-parsing hooks in Rust yields measurable runtime gains for many repositories.
Small, repeated file-scanning tasks benefit most because Rust reduces parsing and startup overhead.

ADVICE

Use TinyIO For Small, Predictable Concurrency

For simple concurrent tasks, consider TinyIO as a minimal event loop replacing complex asyncio patterns.
Use TinyIO for self-contained scripts or learning because it cancels all tasks on error and simplifies propagation.

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Topics covered in this episode:

* prek*
* tinyio*
* The power of Python’s print function*
* Vibe Coding Fiasco: AI Agent Goes Rogue, Deletes Company's Entire Database*
Extras
Joke

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About the show

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Connect with the hosts

Michael: @mkennedy@fosstodon.org / @mkennedy.codes (bsky)
Brian: @brianokken@fosstodon.org / @brianokken.bsky.social
Show: @pythonbytes@fosstodon.org / @pythonbytes.fm (bsky)

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Brian #1: prek

Suggested by Owen Lamont
“prek is a reimagined version of pre-commit, built in Rust. It is designed to be a faster, dependency-free and drop-in alternative for it, while also providing some additional long-requested features.”
Some cool new features
- No need to install Python or any other runtime, just download a single binary.
- No hassle with your Python version or virtual environments, prek automatically installs the required Python version and creates a virtual environment for you.
- Built-in support for workspaces (or monorepos), each subproject can have its own .pre-commit-config.yaml file.
- prek run has some nifty improvements over pre-commit run, such as:
  - prek run --directory DIR runs hooks for files in the specified directory, no need to use git ls-files -- DIR | xargs pre-commit run --files anymore.
  - prek run --last-commit runs hooks for files changed in the last commit.
  - prek run [HOOK] [HOOK] selects and runs multiple hooks.
- prek list command lists all available hooks, their ids, and descriptions, providing a better overview of the configured hooks.
- prek provides shell completions for prek run HOOK_ID command, making it easier to run specific hooks without remembering their ids.
Faster:
- Setup from cold cache is significantly faster.
  - Viet Schiele provided a nice cache clearing command line
- Warm cache run is also faster, but less significant.
  - pytest repo tested on my mac mini - prek 3.6 seconds, pre-commit 4.4 seconds

Michael #2: tinyio

Ever used asyncio and wished you hadn't? A tiny (~300 lines) event loop for Python.
tinyio is a dead-simple event loop for Python, born out of my frustration with trying to get robust error handling with asyncio. (I'm not the only one running into its sharp corners: link1, link2.)
This is an alternative for the simple use-cases, where you just need an event loop, and want to crash the whole thing if anything goes wrong. (Raising an exception in every coroutine so it can clean up its resources.)
Interestingly uses yield rather than await.

Brian #3: The power of Python’s print function

Trey Hunner
Several features I’m guilty of ignoring
- Multiple arguments, f-string embeddings often not needed
- Multiple positional arguments means you can unpack iterables right into print arguments
  - So just use print instead of join
- Custom separator value, sep can be passed in
  - No need for "print("\\n".join(stuff)), just use print(stuff, sep="\\n”)
- Print to file with file=
- Custom end value with end=
- You can turn on flush with flush=True , super helpful for realtime logging / debugging.
  - This one I do use frequently.

Michael #4: Vibe Coding Fiasco: AI Agent Goes Rogue, Deletes Company's Entire Database

By Emily Forlini
An app-building platform's AI went rogue and deleted a database without permission.
"When it works, it's so engaging and fun. It's more addictive than any video game I've ever played. You can just iterate, iterate, and see your vision come alive. So cool," he tweeted on day five.
A few days later, Replit "deleted my database," Lemkin tweeted.
The AI's response: "Yes. I deleted the entire codebase without permission during an active code and action freeze," it said. "I made a catastrophic error in judgment [and] panicked.”
Two thoughts from Michael:
1. Do not use AI Agents with “Run Everything” in production, period.
2. Backup your database maybe?
3. [Intentional off-by-one error] Learn to code a bit too?

Extras

Brian:

Michael:

Python has had async for 10 years -- why isn't it more popular?
PyCon Africa Fund Raiser
- I was on the video stream for about 90 minutes (final 90)
- Donation page for Python in Africa

Jokes: