Thursday, 9th October 2025
TIL: Testing different Python versions with uv with-editable and uv-test.
While tinkering with upgrading various projects to handle Python 3.14 I finally figured out a universal uv recipe for running the tests for the current project in any specified version of Python:
uv run --python 3.14 --isolated --with-editable '.[test]' pytest
This should work in any directory with a pyproject.toml (or even a setup.py) that defines a test set of extra dependencies and uses pytest.
The --with-editable '.[test]' bit ensures that changes you make to that directory will be picked up by future test runs. The --isolated flag ensures no other environments will affect your test run.
I like this pattern so much I built a little shell script that uses it, shown here. Now I can change to any Python project directory and run:
uv-test
Or for a different Python version:
uv-test -p 3.11
I can pass additional pytest options too:
uv-test -p 3.11 -k permissions
I get a feeling that working with multiple AI agents is something that comes VERY natural to most senior+ engineers or tech lead who worked at a large company
You already got used to overseeing parallel work (the goto code reviewer!) + making progress with small chunks of work... because your day has been a series of nonstop interactions, so you had to figure out how to do deep work in small chunks that could have been interrupted