Launch JupyterLab with basic LSP support

.flake8

[flake8]
# Match black
max-line-length = 88
# Allow asymmetric commas, etc.
extend-ignore = 
    E203, 
    # Spurious warnings in JupyterLab for code cells that follow Markdown cells
    E303
exclude = .git,__pycache__,build,dist,.venv
max-complexity = 10

README.md

JupyterLab linting example

See overrides.json for user-settings under @jupyter-lsp/jupyterlab-lsp:plugin. This can be installed / linked into <sys-prefix>/share/jupyter/lab/settings

demo.ipynb

overrides.json

{
  "@jupyter-lsp/jupyterlab-lsp:plugin": {
    "language_servers": {
      "pylsp": {
        "priority": 100,
        "serverSettings": {
          "pylsp.plugins.flake8.config": ".flake8",
          "pylsp.plugins.flake8.enabled": true,
          "pylsp.plugins.pycodestyle.enabled": false,
          "pylsp.plugins.pydocstyle.enabled": false,
          "pylsp.plugins.pyflakes.enabled": false,
          "pylsp.plugins.pylint.enabled": false,
          "pylsp.plugins.yapf.enabled": false
        }
      }
    }
  }
}

postBuild

#!/usr/bin/env bash
set -eux

mkdir -p ${NB_PYTHON_PREFIX}/share/jupyter/lab/settings
cp ./overrides.json ${NB_PYTHON_PREFIX}/share/jupyter/lab/settings

requirements.txt

jupyterlab
python-lsp-server[all]
jupyterlab-lsp
# Code formatting
jupyterlab-code-formatter
black
isort