"Complete" example of pyproject.toml.

[WoosterInitiative]

The existing example pyproject.toml has the extend-exclude options commented out, so the syntax isn't correct. It's possible that it's self-evident to others, but I have not been able to wrap my head around the proper way to do it. It appears that it does not work like the include option.

Here's what mine looks like right now, but returns:
Error: Invalid value for '--extend-exclude': Not a valid regular expression: nothing to repeat at position 0

[tool.black]
    include = [
        '\.pyi?$',
        '^/purchases',
        '^/web_tools',
        '^/setup_sheets',
        '^/tool_compatibility',
        ]
    extend-exclude = '/migrations /__pycache__ *.html'

I'm not sure what I'm doing wrong (and I'll keep trying), but perhaps another example file with the options filled out in such a way as to be complete would help. That and/or keep it consistent with the other options.

There also seem to be multiple issues regarding this example file. I'll try to link them in the comments in case they might fix this issue simultaneously.

Is this related to a problem? Please describe.

Describe the solution you'd like

Describe alternatives you've considered

Additional context

[WoosterInitiative]

#2835 #2487 #541

[WoosterInitiative]

Aaaaaand, now I'm feeling sheepish. I see that the single quotes in the example are actually triple single quotes. So it is a complete example, I just can't read.

I still feel that it could be more consistent with the include option, but not enough to require its own PR.