improve tests for python 3.14

[mattijn]

What is your suggestion?

• Re enable altair tests for python 3.14 that include geopandas cc64b11
• Re enable altair tests for python 3.14 that include duckdb bf2dfe2
• Enable tests for python 3.14t (threaded) if pyarrow is supported bd7b91d

Have you considered any alternative solutions?

No response

[cclauss]

To be confident about free-threaded compatibility, it is recommended to test with pytest-run-parallel.

• https://py-free-threading.github.io/testing

Something like:
% uvx --with=pytest-run-parallel pytest --iterations=8 --parallel-threads=auto

[mattijn]

Thanks @cclauss! I have added another workflow to test the free-threaded version of python 3.14 in #3907. The workflow is currently, as expected, failing, see https://github.com/vega/altair/actions/runs/19181574029/job/54839362746#step:6:1. But hopefully in coming period can check which dev dependencies are the culprit and which tests shall be skipped in this process. Do you have a free-threaded version of python locally to test this a bit more? Otherwise will continue testing through the github action workflow, albeit more cumbersome.

[cclauss]

% uv run pytest -o addopts= --pyargs --doctest-modules --doctest-ignore-import-errors --iterations=8 --parallel-threads=auto tests
--> # Add the dependencies needed...
% uv run --python=3.14t --with=numpy,pandas pytest -o addopts= --pyargs --doctest-modules --doctest-ignore-import-errors --iterations=8 --parallel-threads=auto tests