New Features: use ruff instead of pyflakes for linting

[uprokevin]

Ruff is extremely fast liner, replacement of pyflakes
Try yourself to see the differences:

https://pypi.org/project/ruff/

[dalthviz]

Hi @pprokevin thank you for the feedback! Maybe this python-lsp-server plugin could be useful for this? https://github.com/python-lsp/python-lsp-ruff

Also, what do you think about this @spyder-ide/core-developers ?

[mrclary]

I don't know what the trade-offs are, but I like fast better than slow 😄

[CAM-Gerlach]

Main trade off is just requiring a transitive dependency on compiled Rust code, but given Spyder already depends on a ton of other compiled code with the NumPy/SciPy/Pandas/Matplotlib stack, one more doesn't seem that big of a deal in exchange for greater speed and lots more built in linters (though the speed boost is likely limited by the overhead of PyLSP processing and IPC comms). Integration shouldn't be difficult on the backend side since there's already a PyLSP plugin for it, but we might need to make some Spyder side tweaks (though it is supposed to be mostly high-level compatible with flake8 and its error codes, etc).

[zefr0x]

(though the speed boost is likely limited by the overhead of PyLSP processing and IPC comms)

No longer as issue, since ruff v0.4.5 introduced as an LSP embedded directly in ruff.

Also, they have plans to support general language server features, so PyLSP could be also replaced as will in the future.

https://astral.sh/blog/ruff-v0.4.5