Brought to you by Michael and Brian - take a Talk Python course or get Brian's pytest book

#337: Backtracking For a Package

Published Tue, May 23, 2023, recorded Tue, May 23, 2023
Watch this episode on YouTube
Play on YouTube
Watch the live stream replay

About the show

Sponsored by us! Support our work through:

Connect with the hosts

Join us on YouTube at pythonbytes.fm/live to be part of the audience. Usually Tuesdays at 11am PT. Older video versions available there too.

Michael #1: Ruff PyCharm plugin

  • via John Hagen
  • Ruff PyCharm plugin has great integration, it will highlight Ruff lint errors in the IDE as you type and you can even apply Alt+Enter (⌥⏎ on Mac) quick fixes through the IDE.
  • Ruff will automatically fix the fixable issues.
  • John also added additional PyCharm-specific instructions for black/Ruff

Brian #2: Writing Python like it's Rust

  • Kobzol
  • Rust lessons guiding use of types and type hints in Python
    • Add type hints tun function signatures
    • Use dataclasses instead of tuples or dictionaries to increase clarity and type safety
    • Union types to clarify | typing

Michael #3: Pip 23.1 Released - Massive improvement to backtracking

  • Pip 23.1 was released last month
  • Highlight the significant improvement in backtracking that is part of the requirement resolver process in Pip. This process involves Pip finding a set of packages that meet your requirements and whose requirements themselves don't conflict.
  • Prior to Pip 20.3, the default process for Pip would allow conflicting requirements to install if they were transitive dependencies where the last one specified would be the one installed.
  • Once the new resolver was turned on by default it immediately hit problems where backtracking would get stuck for a long time.
  • Pip separates out the resolution logic into a library called resolvelib. It had been discovered that there was a logical error under certain circumstances, and also there was a known better backtracking technique it could employ called backjumping.
  • Both of these were recently fixed and implemented in resolvelib, which were then vendored in to Pip 23.1.

Brian #4: Markdown Code Runner

  • markdown-code-runner is a Python package that automatically executes code blocks within a Markdown file, including hidden code blocks, and updates the output in-place.
  • Works with Python & Bash
  • see also cog

Extras

Brian:

Michael:

  • Python 3.12.0a7 is out
  • python3 -m venv --upgrade-deps venv (via John Hagen)
  • Talk submissions are now open for both remote and in-person talks at the 2023 PyConZA? The conference will be held on 5 and 6 October 2023 in Durban, South Africa. South Africa is GMT+2, so the times are convenient for Africa, Europe and much of Asia, although probably less so for the rest of the world. All details are on za.pycon.org - via Kim van Wik
  • Trail discovery/riding apps

Joke: User Inyerface


Want to go deeper? Check our projects