In the mean time I am using this hack:

autocmd FileType python nnoremap <buffer> K :call PyDocVim()<CR>

function! PyDocVim()
python3 << EOF
import jedi

curfile = vim.current.buffer.name
row = vim.current.window.cursor[0]
col= vim.current.window.cursor[1]

script = jedi.Script(
    source=None,
    path=curfile,
    line=row,
    column=col)

try:
    definitions = script.goto_definitions()
except Exception:
    # print to stdout, will be in :messages
    definitions = []
    print("Exception, this shouldn't happen.")
    print(traceback.format_exc())

    if not definitions:
        echo_highlight("No documentation found for that.")
        vim.command("return")

docs = []
for d in definitions:
    doc = d.docstring()
    if doc:
        title = "Docstring for %s" % d.desc_with_module
        underline = "=" * len(title)
        docs.append("%s\n%s\n%s" % (title, underline, doc))
    else:
        docs.append("|No Docstring for %s|" % d)
    text = ("\n" + "-" * 79 + "\n").join(docs)
vim.command("let docWidth = %s" % len(title))
vim.command("let doc_lines = %s" % len(text.split("\n")))
EOF
    "Scroll
    function! s:popup_filter(winid, key)
        if a:key ==# "\<c-k>"
            call win_execute(a:winid, "normal! \<c-y>")
            return v:true
        elseif a:key ==# "\<c-j>"
            call win_execute(a:winid, "normal! \<c-e>")
            return v:true
        elseif a:key ==# 'q' || a:key ==# 'x'
            return popup_filter_menu(a:winid, 'x')
        endif
        return v:false
    endfunction

    let lines = py3eval('text')
    let winid = popup_create(lines->split('\n'), #{
            \ filter: function('s:popup_filter'),
            \ pos: 'botleft',
            \ line: 'cursor-1',
            \ col: 'cursor',
            \ moved: 'any',
            \ border: [1,1,1,1,1,1,1,1],
            \ borderchars: ['─', '│', '─', '│', '┌', '┐', '┘', '└'],
            \ borderhighlight: ['Todo'],    
            \ padding: [0,1,0,1],
            \ firstline: 1,
            \ scrollbar: 1,
            \ minwidth: docWidth,
            \ maxwidth: 74,
            \ minheight: doc_lines,
            \ maxheight: 20,
            \ mapping: 0,
            \ })

    call setbufvar(winbufnr(winid), '&syntax','rst')
    call setwinvar(winid, '&wincolor', 'Normal')
endfunction

looks so cooool!
although i met some error

|| Error detected while processing function
|| PyDocVim[38]
|| Traceback (most recent call last):
||   File "<string>", line 11, in <module>
||   File "/usr/lib64/python3.6/site-packages/jedi/api/__init__.py", line 95, in __init__
||     with open(path, 'rb') as f:
|| FileNotFoundError: [Errno 2] No such file or directory: ''
|| line   53:
|| Traceback (most recent call last):
||   File "<string>", line 1, in <module>
|| NameError: name 'text' is not defined
|| E858: Eval did not return a valid python object
|| line   54:
|| E121: Undefined variable: docWidth
|| E116: Invalid arguments for function popup_create(lines->split('\n'), #{ filter: function('s:popup_filter'), pos: 'botleft', line: 'cursor-1', col: 'cursor', moved: 'any', border: [1,1,1,1,1,1,1,1], borderchars: ['─', '│', '─', '│', '┌', '┐', '┘', '└'], borderhighlight: ['Todo'],     padding: [0,1,0,1], firstline: 1, scrollbar: 1, minwidth: docWidth, maxwidth: 74, minheight: doc_lines, maxheight: 20, mapping: 0, })
|| line   73:
|| E121: Undefined variable: winid
|| E116: Invalid arguments for function winbufnr(winid), '&syntax','rst')
|| E116: Invalid arguments for function setbufvar
|| line   74:
|| E121: Undefined variable: winid
|| E116: Invalid arguments for function setwinvar

it looks like related to jedi.

OS: Gentoo Linux 5.4
vi: vim 8.2.0114
py: cpython 3.6.10

What does your code look like? does it work on other words?

This is the error I get. I tried K on the "print" word. I also tried on other words and the same thing happens. Should I have any additional plugin for this to work?

You could try updating jedi, why is vim calling pynvim? Are you using Neovim(I don't expect the hack to work there)

To be honest, I don't know exactly what I did in my personal setup but I do have floating documentation for python codes... not sure if provided by python-mode or some mix of python-mode with other plugins though.

My vim setup is here, and I haven't added any special "patch". But again, I don't know which plugin is exactly providing that... 😂
https://gitlab.com/diraol/my_vim

You could try updating jedi, why is vim calling pynvim? Are you using Neovim(I don't expect the hack to work there)

Oh. Yes, indeed I am using NeoVim.

To be honest, I don't know exactly what I did in my personal setup but I do have floating documentation for python codes... not sure if provided by python-mode or some mix of python-mode with other plugins though.

My vim setup is here, and I haven't added any special "patch". But again, I don't know which plugin is exactly providing that... joy
https://gitlab.com/diraol/my_vim

Do you use vim or nvim?

To be honest, I don't know exactly what I did in my personal setup but I do have floating documentation for python codes... not sure if provided by python-mode or some mix of python-mode with other plugins though.

My vim setup is here, and I haven't added any special "patch". But again, I don't know which plugin is exactly providing that... 😂
https://gitlab.com/diraol/my_vim

Looks like YCM

Do you use vim or nvim?

vim

Looks like YCM

Hum.... good catch, could be indeed.

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