jedi VS Python-mode

I don't use jedi at all, but from a quick glance at the README of the package you've installed, the code you've posted in your post installs the wrong repo; it seems davidhalter/jedi is just jedi's backend. To make it work with vim, install one of the plugins suggested in the README instead (it seems that davidhalter/jedi-vim) is the one you're looking for.

Jedi: https://github.com/davidhalter/jedi

Or better, use refactoring tool like rope, jedi, or whatever you have in your IDE to rename them.

Get jedi working in Kate · Issue #1539 · davidhalter/jedi

For text completion, Jedi. For automated refactoring, I highly recommend rope. Some of the previously mentioned plugins provides Vim integrations with these excellent tools.

Take a look at some LSP servers that use Jedi https://github.com/davidhalter/jedi

I've been playing with some ideas for creating a SQLite database of classes, functions and suchlike found in Python code, so I can analyze my codebases with SQL queries.

I've had some good initial results with https://github.com/davidhalter/jedi - which is the Python introspection library that powers various editor autocomplete implementations. I have a prototype which uses that to create a SQL database of functions, classes and places that they are used.

I've also been playing with https://github.com/github/semantic - it can parse Python, JavaScript and other languages and offers a --json-symbols option which dumps out a JSON object showing the symbols (functions, variables etc) found in the code.

As for the Vim auto complete plug-in to use. The biggest (and rather quite bloated provider) are coc and youcompleteme. Vim had countless other completion provider plugins over the years, I lost track of which ones are still good to use and which ones should already be superseded by better techs, but one I personally use python-mode, which uses rope and vim-lsp which supports pylsp.

python-mode plugin works well as an IDE-like solution: https://github.com/python-mode/python-mode

If you're happy with a plugin, pymode (https://github.com/python-mode/python-mode) is worth a look. Map running to r (or whatever works for you) makes running easy. End result is IDE-like.

If you want a quick start to building Vim based IDE for Python, I recommend python-mode. It gives you most of the things you're going to need in one plugin, there are often better implementations of some of its features in other more specialised plugins, but if you don't have time to research and learn to integrate a lot of different plugins, it's a great base to start from. Over time as you learn how you prefer to work and found specialised plugins that suits your workflow better, you can disable many of its features and replace them with more specialised plugins.

I also highly recommend python-mode for Python refactoring using python-rope. It supports variable/function/class renaming, extract method/local variable, variable/method inlining, adding/removing/rearranging parameters from method signature, removing unused and duplicate imports, and many other useful code transformations.

However, adding all these things by hand takes time. I only know python so that's what im using vim for, and i tried out pymode, but that's way too many features introduced at once. For this reason I've also avoided using others configurations.

Eg for python (there are several others) https://github.com/python-mode/python-mode

There is a plugin called python-mode. This adds syntax highlighting and many other features to your vim.

Update that tool to work with Python. For example, Python-Mode.