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AttributeError when using let g:jedi#show_call_signatures = 2

See original GitHub issue

Issue

jedi 0.11.1
vim 8.0.1553
Windows 10 x64
[I don't know how to obtain jedi-vim version]

When using let g:jedi#show_call_signatures = 2 in my .vimrc (together with set noshowmode, of course), Vim produces the following error instead of showing the function signature on the command line:

Traceback (most recent call last):
  File "...vim/vimfiles\pythonx\jedi_vim.py", line 128, in wrapper
    return func(*args, **kwargs)
  File "...vim/vimfiles\pythonx\jedi_vim.py", line 457, in cmdline_call_signatures
    max_msg_len -= len(signatures[0].call_name) + 2  # call name + parentheses
AttributeError: 'CallSignature' object has no attribute 'call_name'

Curiously enough, let g:jedi#show_call_signatures = 1 works perfectly, showing the popup with the correct function signature.

Steps to reproduce

Create an empty Python file, edit it with Vim and include the following text:

import time
time.sleep(

After typing the opening parentheses the error is produced, silently. The error message is only visible when typing :messages after it has produced, in my Vim setup.

No difference between my usual .vimrc and a minimal one, but I’m including here the minimal one I’ve used for testing:

set nocompatible
set noshowmode

let script_dir = fnamemodify(expand('<sfile>'), ':h')
let &runtimepath .= ','.script_dir.','.script_dir.'/after'

" Put your config changes here.
let g:jedi#show_call_signatures=2

syntax on
filetype plugin indent on

Output of “:verbose JediDebugInfo”

I’m sorry, when trying to get JediDebugInfo I got the following error:

Messages maintainer: Bram Moolenaar <Bram@vim.org>
"test.pyw" [unix] 2L, 17C
Error detected while processing function jedi#debug_info:
line   28:
Traceback (most recent call last):
  File "C:/Users/DervishD/Desktop/Drive/config/vim/vimfiles\pythonx\jedi_vim_debug.py", line 34, in display_debug_info
    for p in jedi_vim.jedi.Script('')._evaluator.sys_path:
AttributeError: 'Evaluator' object has no attribute 'sys_path'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "C:/Users/DervishD/Desktop/Drive/config/vim/vimfiles\pythonx\jedi_vim_debug.py", line 38, in display_debug_info
    "{0!r})".format(e))
  File "C:/Users/DervishD/Desktop/Drive/config/vim/vimfiles\pythonx\jedi_vim_debug.py", line 8, in echo
    vim.command('echo {0}'.format(msg))
vim.error: Vim(echo):E117: Unknown function: AttributeError
E171: Missing :endif