What does HackerNews think of ale?

Ctrl-X Ctrl-L is line based completion, see :help CTRL-X_CTRL-L for details.

:help ins-completion gets the useful docs, Vim's own docs are very good and worth spending some time learning how to use, so you can learn Vim itself better.

Another favorite of mine is 'gf' to open the filename under the cursor, very useful combined with ^X ^F.

Omni completion is also useful: https://vim.fandom.com/wiki/Omni_completion although you're better off with plugin that uses LSP now, for example https://github.com/dense-analysis/ale

FWIW, I still use regular vim with ale [0] and it does everything I want. It formats files with Black and isort, shows ruff and pyright errors, supports jumping to definitions, and has variable information available on hover. It also does this for every other language I write in. I have collected my config over the past several years, but I pretty rarely encounter errors with it. It requires no additional dependencies except for the language tools themselves (Black, ruff, etc.).

[0]: https://github.com/dense-analysis/ale [1] https://github.com/CGamesPlay/dotfiles/blob/master/files/.co...

I typically use mypy. It's been around for over a decade, is available in many package repos, and has pretty good integration with vim lint plugins such as ALE (https://github.com/dense-analysis/ale).