Topics covered in this episode:

* Free-threaded Python no longer “experimental” as of Python 3.14*
typed-ffmpeg
pyleak
* Optimizing Test Execution: Running live_server Tests Last with pytest*
Extras
Joke

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Brian #1: Free-threaded Python no longer “experimental” as of Python 3.14

Michael #2: typed-ffmpeg

typed-ffmpeg offers a modern, Pythonic interface to FFmpeg, providing extensive support for complex filters with detailed typing and documentation.
Inspired by ffmpeg-python, this package enhances functionality by addressing common limitations, such as lack of IDE integration and comprehensive typing, while also introducing new features like JSON serialization of filter graphs and automatic FFmpeg validation.
Features :
- Zero Dependencies: Built purely with the Python standard library, ensuring maximum compatibility and security.
- User-Friendly: Simplifies the construction of filter graphs with an intuitive Pythonic interface.
- Comprehensive FFmpeg Filter Support: Out-of-the-box support for most FFmpeg filters, with IDE auto-completion.
- Integrated Documentation: In-line docstrings provide immediate reference for filter usage, reducing the need to consult external documentation.
- Robust Typing: Offers static and dynamic type checking, enhancing code reliability and development experience.
- Filter Graph Serialization: Enables saving and reloading of filter graphs in JSON format for ease of use and repeatability.
- Graph Visualization: Leverages graphviz for visual representation, aiding in understanding and debugging.
- Validation and Auto-correction: Assists in identifying and fixing errors within filter graphs.
- Input and Output Options Support: Provide a more comprehensive interface for input and output options, including support for additional codecs and formats.
- Partial Evaluation: Enhance the flexibility of filter graphs by enabling partial evaluation, allowing for modular construction and reuse.
- Media File Analysis: Built-in support for analyzing media files using FFmpeg's ffprobe utility, providing detailed metadata extraction with both dictionary and dataclass interfaces.

Michael #3: pyleak

Detect leaked asyncio tasks, threads, and event loop blocking with stack trace in Python. Inspired by goleak.
Use as context managers or function dectorators
When using no_task_leaks, you get detailed stack trace information showing exactly where leaked tasks are executing and where they were created.
Even has great examples and a pytest plugin.

Brian #4: Optimizing Test Execution: Running live_server Tests Last with pytest

Tim Kamanin
“When working with Django applications, it's common to have a mix of fast unit tests and slower end-to-end (E2E) tests that use pytest's live_server fixture and browser automation tools like Playwright or Selenium. ”
Tim is running E2E tests last for
- Faster feedback from quick tests
- To not tie up resources early in the test suite.
He did this with
- custom “e2e” marker
- Implementing a
```
pytest_collection_modifyitems
```
  hook function to look for tests using the
```
live_server
```
  fixture, and for them
  - automatically add the e2e marker to those tests
  - move those tests to the end
The reason for the marker is to be able to
- Just run e2e tests with -m e2e
- Avoid running them sometimes with -m "not e2e"
Cool small writeup.
- The technique works for any system that has some tests that are slower or resource bound based on a particular fixture or set of fixtures.

Extras

Brian:

Is Free-Threading Our Only Option? - Interesting discussion started by Eric Snow and recommended by John Hagen
Free-threaded Python on GitHub Actions - How to add FT tests to your projects, by Hugo van Kemenade

Michael:

New course! LLM Building Blocks in Python
Talk Python Deep Dives Complete: 600K Words of Talk Python Insights
.folders on Linux
- Write up on XDG for Python devs.
They keep pulling me back - ChatGPT Pro with o3-pro
Python Bytes is the #1 Python news podcast and #17 of all tech news podcasts.
Python 3.13.4, 3.12.11, 3.11.13, 3.10.18 and 3.9.23 are now available
Python 3.13.5 is now available!

Joke: Naming is hard

Ep 528 Alina Astilean, Ian Beck, Dominic & Lauren Suozzi

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