#433 Dev in the Arena
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Topics covered in this episode:

- [**git-flight-rules**](https://github.com/k88hudson/git-flight-rules?featured_on=pythonbytes))

• Uravelling t-strings)

• neohtop)

• Introducing Pyrefly: A new type checker and IDE experience for Python)

• Extras

• Joke

Watch on YouTube)

About the show

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• Our courses at Talk Python Training)

• The Complete pytest Course)

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Connect with the hosts

• Michael: @[email protected]) / @mkennedy.codes) (bsky)

• Brian: @[email protected]) / @brianokken.bsky.social)

• Show: @[email protected]) / @pythonbytes.fm) (bsky)

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Michael #1: git-flight-rules)

• What are "flight rules"?

• A guide for astronauts (now, programmers using Git) about what to do when things go wrong.

• Flight Rules are the hard-earned body of knowledge recorded in manuals that list, step-by-step, what to do if X occurs, and why. Essentially, they are extremely detailed, scenario-specific standard operating procedures. [...]

• NASA has been capturing our missteps, disasters and solutions since the early 1960s, when Mercury-era ground teams first started gathering "lessons learned" into a compendium that now lists thousands of problematic situations, from engine failure to busted hatch handles to computer glitches, and their solutions.

• Steps for common operations and actions

• I want to start a local repository)

• What did I just commit?)

• I want to discard specific unstaged changes)

• Restore a deleted file)

Brian #2: Uravelling t-strings)

• Brett Cannon

• Article walks through

• Evaluating the Python expression

• Applying specified conversions

• Applying format specs

• Using an Interpolation class to hold details of replacement fields

• Using Template class to hold parsed data

• Plus, you don’t have to have Python 3.14.0b1 to try this out.

• The end result is very close to an example used in PEP 750), which you do need 3.14.0b1 to try out.

• See also:

• I’ve written a pytest version, Unravelling t-strings with pytest), if you want to run all the examples with one file.

Michael #3: neohtop)

• Blazing-fast system monitoring for your desktop

• Features

• Real-time process monitoring

• CPU and Memory usage tracking

• Beautiful, modern UI with dark/light themes

• Advanced process search and filtering

• Pin important processes

• Process management (kill processes)

• Sort by any column

• Auto-refresh system stats

Brian #4: Introducing Pyrefly: A new type checker and IDE experience for Python)

• From Facebook / Meta

• Another Python type checker written in Rust

• Built with IDE integration in mind from the beginning

• Principles

• Performance

• IDE first

• Inference (inferring types in untyped code)

• Open source

• I mistakenly tried this on the project I support with the most horrible abuses of the dynamic nature of Python, pytest-check). It didn’t go well. But perhaps the project is ready for some refactoring. I’d like to try it soon on a more well behaved project.

Extras

Brian:

• Python: The Documentary Official Trailer)

• Tim Hopper added Setting up testing with ptyest and uv) to his “Python Developer Tooling Handbook”

• For a more thorough intro on pytest, check out courses.pythontest.com)

• pocket is closing), I’m switching to Raindrop)

• I got one question about code formatting. It’s not highlighted, but otherwise not bad.

Michael:

• New course! Polars for Power Users: Transform Your Data Analysis Game)

• Apache Airflow 3.0 Released)

• Paste 5)

Joke: Theodore Roosevelt’s )Man in the Arena), but for programming)