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Level 1: Formatting defaults for all your projects

Install the required tools in your Python or Conda environment. Note that isort and black have minimal dependencies and should not break your setup.

pip install isort
pip install black

In the user settings.json (see How are settings managed), add:

"editor.rulers": [99],
"editor.formatOnSave": true,
"python.formatting.provider": "black",
"python.formatting.blackArgs": ["--line-length=99"],
"python.sortImports.args": [
    "--profile", "black",
    "--line-length", "99"
],
"[python]": {
    "editor.codeActionsOnSave": {
        "source.organizeImports": true
    }
},

This will provide defaults for all the Python projects you edit. Replace 99 by your prefered line length.

Skip the editor.rulers setting if you do not want an indication of the line length in the editor.