Notebooks: Test phase 2 data science libraries in Notebooks

[cindyytong]

Followup ticket to #10794 to test phase 2 popular python libraries in Positron notebooks

For each of the below:

1. Manually test with some core workflows for the library
2. Save the notebook you use to test in QA example content to be reused in the future
3. Determine if there's any automated testing we should include - ticket out

In order of priority for testing

1. Altair - issue logged: Enable rendering of Altair charts in Positron Notebook Editor #12657
2. sqlalchemy
3. requests
4. Spacy
5. xgboost
6. opencv

[matthiasgomolka]

Not sure if this is the right place, but I discovered that Altair does not work with Positron's new notebook editor.

The whole notebook turns blank when I want to display an Altair chart.

[cindyytong]

Hello @matthiasgomolka thank you for raising. The notebook turning blank when there are errors in rendering should be addressed in this issue which will be included in our upcoming April release. #11859.

While testing on a daily build, i was able to produce an error when trying to render Altair plots and have logged here #12657

If you are able to reproduce your issue on a daily build or with the April release, can you confirm if you see a similar error message as #12657

[matthiasgomolka]

I can reproduce the error with this version:

Positron Version: 2026.04.0 (user setup) build 217
Code - OSS Version: 1.109.2
Commit: c87af6bdec1f7cb6057b76a4b8e30280bb584ae7
Date: 2026-03-27T08:11:25.493Z
Electron: 39.3.0
Chromium: 142.0.7444.265
Node.js: 22.21.1
V8: 14.2.231.22-electron.0
OS: Windows_NT x64 10.0.26200