Auto-install neovim and jedi python packages

[Rizhiy]

Currently, to make the plugin work properly I have to install neovim and jedi packages into every virtual environment I use. This is rather annoying if you have a lot of them (I have 20+).

I think there are two options:

• Allow easy installation of neovim and jedi packages from inside vim, similar to pylint. This is not ideal, since there will be a lot of package duplication, but much less annoying.
• Allow specifying a path to packages installed in other environments. I know you are able to specify jediPath currently, but it is not clear what exactly it should point to. Pointing it to package folder does not work for me. The option is not present for neovim package.

[wookayin]

+1 I agree that there should be an easy way to auto install necessary packages.

You can actually configure it on your own to have auto-install scripts in your init.vim or vimrc. For example:

function! Autoinstall_pynvim()
  let l:python3_neovim_path = substitute(system("python3 -c 'import pynvim; print(pynvim.__path__)' 2>/dev/null"), '\n\+$', '', '')
  if empty(l:python3_neovim_path)
    execute ("!python3 -m pip install pynvim")
  endif
endfunction

autocmd VimEnter * Autoinstall_pynvim()
" or :call timer_start(0, { -> Autoinstall_pynvim() })

To see more advanced or full setup, you can have a look at my init.vim.

[skriems]

@Rizhiy I currently have

let g:python3_host_prog = "$HOME/.virtualenvs/nvim3/bin/python"
let g:python_host_prog = "$HOME/.virtualenvs/nvim2/bin/python"

with the respectively created envs where I install neovim and jedi and have set "python.venvPath": "~/.virtualenvs", in my coc-settings.

How do you see that your setup does not work? What kind of error message to you get? I'm just wondering if my setup works, because I don't get any errors, but completion does not work very well (I don't work much in Python these days)

[Rizhiy]

@skriems I use conda instead of venv, still:

I have tried using:

let g:python3_host_prog = "$HOME/anaconda3/envs/nvim/bin/python"

And pointed "python.venvPath" to my ~/anaconda3/envs, but this led to jedi not being able to find any of my installed packages.

As I currently understand, python host must match the environment python for language server to work properly.

[yujinyuz]

@Rizhiy I currently have this in my coc-settings.json

  "python.jediEnabled": true,
  "python.jediPath": "~/.pyenv/versions/nvim/lib/python3.7/site-packages",

And I don't have any problems with it

[WhyNotHugo]

Just tell nvim where you system python is, and it'll use that:

let g:python3_host_prog = '/usr/bin/python'

Just make sure you've you OS's python-pynvim package installed, as well as python-jedi.