DOC Update Pyodide to 314.0.4 in JupyterLite deployment - #34534

I updated the lockfiles locally, but they didn't update jupyterlite-core and jupyterlite-pyodide-kernel, as they are pinned by jupyterlite-sphinx. I'll have to make a release with relaxed constraints there, and will come back here when done.

I updated the lockfiles locally, but they didn't update jupyterlite-core and jupyterlite-pyodide-kernel, as they are pinned by jupyterlite-sphinx. I'll have to make a release with relaxed constraints there, and will come back here when done.

https://github.com/jupyterlite/jupyterlite-sphinx/releases/tag/v0.23.0 is now out, and this PR is now unblocked.

Good to know that polars is back even if browsing quickly https://github.com/xlwings/polars-pyodide/ it seems like support is not from the main polars repo. It's probably still a bit brittle but at least it is going in the right direction 😉!

Yes, indeed. polars upstream is a bit hesitant to add back support for Emscripten/Pyodide as conversations have emerged in pola-rs/polars#24058 and elsewhere. However, https://github.com/xlwings/polars-pyodide/?rgh-link-date=2026-08-17T10%3A16%3A45Z continues to build and function with most features enabled (outside of cloud features and the like).

I think the lock-file will be updated by #34763. Once this is merged, then I guess only the jupyter-lite.json can remain in this PR?

Basically, I'd rather merge #34763 first to avoid creating conflicts.

Works for me, @lesteve; I'm happy to rebase after that one is merged!

Two questions trying it out on in the generated doc on this example that uses polars with this JupyterLite link

• is polars.read_parquet supposed to work? I get an error like AttributeError: type object 'builtins.PyLazyFrame' has no attribute 'new_from_parquet' which does ring a bell. It is downloaded from https://cdn.jsdelivr.net/pyodide/v314.0.4/full/polars-1.33.1-cp314-cp314-pyemscripten_2026_0_wasm32.whl
• trying to install the scikit-learn development wheel complains, it says it can't find a Pure Python wheel. Probably we don't have the right set of wheels in our scientific-python-nightly-wheel space, we would need pyodide_2026 one?