Any advice on picking a Python language server for emacs? (programming.dev)

submitted 3 months ago by webbureaucrat@programming.dev to c/python@programming.dev

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Hi, folks!

I'd like to set up my emacs with lsp-mode and lsp-ui, but I am finding myself in some analysis paralysis. Ruling out the Palantir language server because it's deprecated and because it's Palantir, that still leaves me with five language server recommendations from lsp-mode.

Anybody have any opinions they'd like to share? Any really bad experiences I should avoid? How do I configure your favorite? (Feel free to assume I know very little about configuring emacs.)

If it makes a difference, I am a poetry user and a religious mypy --strict user.

Thanks in advance!

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[-] eager_eagle@lemmy.world 3 points 3 months ago* (last edited 3 months ago)

Ruff.

MS LSP is also deprecated in favor of Microsoft's pylance AFAIK. I've never used Jedi much, but it's one of the older ones and not very comprehensive to my knowledge. Ruff is relatively new but they already have >800 rules and increasing. Ruff is by far the fastest too.

No thoughts on py-lsp.

Ah, just be sure to enable most (or all) rules with ruff, as the default rule sets are pretty relaxed.

[-] wewbull@feddit.uk 2 points 3 months ago

Sounds like things are going very wrong in lsp land. The point of a language server is to support lots of types of tools through an abstracted server. Not to have one server per tool.

Otherwise, just use fly-checker. It can even get information from multiple tools at once.

[-] eager_eagle@lemmy.world 1 points 3 months ago

what do you mean by one server per tool?

[-] wewbull@feddit.uk 2 points 3 months ago

Op was listing different Lsp servers for things like jedi, pyright, etc. All of those things should really integrate with a single server.

[-] eager_eagle@lemmy.world 1 points 3 months ago

insert standards xkcd

[-] Fred@programming.dev 2 points 3 months ago

That seems like a weird dichotomy between ruff and Jedi. One does linting & formatting, the other code completion, goto-definition, refactoring. With pylsp you can have both: it uses Jedi (in the default config), and has a plugin to call ruff for linting and formatting (according to the doc; I don't actually use ruff).

[-] eager_eagle@lemmy.world 1 points 3 months ago* (last edited 3 months ago)

I forgot pyright: it might be a good choice, but since you like strict mode, see basedpyright instead. I don't know about integrating it with emacs though.

I'd pick between Ruff and (based)pyright - maybe both if that works in emacs.