chore(python): Add a lint-only Makefile option

[alexander-beedie]

More cleanly separates the linting and formatting options in theMakefile (it was never clear to me why "fmt" would also trigger linting as they are not the same thing)

Update; PR now just adds make lint (no change to fmt).

Example

make lint  # new; runs only the ruff/mypy linting ✔️

[stinodego]

I don't think there's a clear distinction here, because the ruff linter also does formatting, e.g. it will autofix bad lints which will end up reformatting the code.

I don't like running pre-commit because clippy is slow. make fmt runs all the Python-side linting/formatting, which is great and all I need usually.

You can run mypy separately if you need to (I do that regularly if only mypy fails).

[alexander-beedie]

I don't think there's a clear distinction here, because the ruff linter also does formatting, e.g. it will autofix bad lints which will end up reformatting the code.

The "make fmt" and "make lint" options observe the same difference as ruff format and ruff check, which seems fairly obvious to me. Fixing lints isn't really formatting, even if it can result in a few such cases as a side-effect of the chosen rules.

I don't like running pre-commit because clippy is slow. make fmt runs all the Python-side linting/formatting, which is great and all I need usually.

And if you haven't done a cargo clean for a while it can go a little ballistic; I just scrubbed ~96GB and it settled down again 🤣

[stinodego]

It's not clear to me when you would need to run the two commands separately?

All I know is that I don't want my current make fmt to change. Feel free to add a make lint though if you really need it.

[alexander-beedie]

It's not clear to me when you would need to run the two commands separately?

When I want to check lint before going for pre-commit. I don't need a separate formatting step as my IDE keeps that in line automatically on code save (there's a ruff plugin for PyCharm that can read your project's settings).

Feel free to add a make lint though if you really need it.

Will do that and revert for fmt👌
(Though still feels odd for a formatting directive to trigger linting ;)

[alexander-beedie]

Feel free to add a make lint though if you really need it.

Done 👍