Does not work in VS Code Jupyter Notebooks

[grahamwetzler]

Neither %load_ext nb_black nor %load_ext lab_black work with Jupyter Notebooks in Visual Studio Code. There is no error. The code just doesn't format.

• nb-black version 1.0.7
• VS Code version 1.42.1
• VS Code Python Extension version 2020.2.64397
• Python version 3.8.1

[michaelaye]

Can one not simply use the black functionality of VSCode in there?

[grahamwetzler]

The format document command does not appear in the command palette while in a notebook.

[MarcoGorelli]

@grahamwetzler the black functionality in VScode only works on .py files, as far as I can tell.

In case it's useful to you, though, I've made a tool which might be helpful to you - https://github.com/nbQA-dev/nbQA. You can use it via the command-line as

python -m pip install -U nbqa
nbqa black my_notebook.ipynb

It only works via the command-line or as a pre-commit hook though, so it's certainly not a replacement for the excellent tool that black_nb is

---

pre-commit example:

- repo: https://github.com/nbQA-dev/nbQA
  rev: 1.5.3
  hooks:
    - id: nbqa-black

---

EDIT: as for 2022, black has a built-in black-jupyter hook, so the above suggestion to use nbQA is no longer necessary

[LucasHattoriCosta]

Just leaving as another suggestion: there is a command for format_cell available in VsCode. In Mac the shortcut is shift+option+F
Again, not a real replacement for the excelent tool that is nb_black, but better than having un-linted code 😅

[morberg]

https://github.com/n8henrie/jupyter-black works really well for me.