Python kernel should be able to import geopandas

[krassowski]

• Closes Add a test to ensure that geopandas can be imported #225
• Moves a kernel switching test into the appropriate group

[agriyakhetarpal]

Hmm, the reason this doesn't work is because geopandas is not in the lockfile: https://cdn.jsdelivr.net/pyodide/v0.28.2/full/pyodide-lock.json?from-lite-config=1

As above – we'd need to either add geopandas to the lockfile (with a new lockfile URL, that is) or ship it with the kernel at build time

[krassowski]

Do I just add it to https://github.com/JupyterEverywhere/jupyterlite-extension/blob/main/lite/requirements.txt ?

[agriyakhetarpal]

No, that wouldn't work. We'll either need to ship it here: https://jupyterlite.readthedocs.io/en/latest/howto/pyodide/wheels.html with the artifacts (which I don't recommend – it's a big binary we don't have a dedicated CDN to serve it).

It is not being built from its recipe right now because it depends on pyproj, which is currently disabled: https://github.com/pyodide/pyodide-recipes/blob/95e307bce9adc7d6e41afe7a8192c213a1d633e8/packages/pyproj/meta.yaml#L5. There is an in-progress PR to re-enable it: pyodide/pyodide-recipes#356

[agriyakhetarpal]

Or, we would need to use an older Pyodide kernel with Pyodide 0.27, as we have it there: https://cdn.jsdelivr.net/pyodide/v0.27.6/full/pyodide-lock.json?from-lite-config=1. That won't be easy, as the Pyodide kernel and the Pyodide version within it are coupled, and the former pins JupyterLite. Going to an older version of JupyterLite would be undesirable for us.

[krassowski]

Is there a reason newer pyodide versions dropped geopandas? Is there a way we could help upstream?

[agriyakhetarpal]

Is there a reason newer pyodide versions dropped geopandas? Is there a way we could help upstream?

It was just because pyproj was failing to build, more details here: pyodide/pyodide-recipes#99

Yes, I think we can help upstream by fixing the pyproj build failure. I can then publish a new nightly release, which should give us a new lockfile URL that we can override for the Pyodide kernel in jupyter-lite.json.