Youcompleteme: The imp module is deprecated in favour of importlib

[andreyugolnik]

I have deprecation warning at VIM startup:
"DeprecationWarning: the imp module is deprecated in favour of importlib; see the module's documentation for alternative uses"

macOS: 10.13.5
VIM: 8.1 (installed via brew)
Python: 3.7.0 (installed via brew)
Latest version of YouCompleteMe plugin (installed via VimPlug)

How I can fix that?

[alphastorm]

I'm also getting the same warning:

Error detected while processing function youcompleteme#Enable[3]..<SNR>80_SetUpPython:
line   42:
/must>not&exist/foo:1: DeprecationWarning: the imp module is deprecated in favour of importlib; see the module's documentation for alternative uses

macOS: 10.13.5
VIM: 8.1 (brew install macvim --with-override-system-vim)
Python: 2.7.15 (brew)
Also on the latest version of YouCompleteMe (./install.py --go-completer --js-completer and using vim-plug).

I've tried uninstall/re-installing vim and re-installing YCM to no avail.

[alphastorm]

Update: looks like the new version of vim was installing with python3 somehow (via :version), was able to fix my issue by installing with brew install macvim --with-override-system-vim --with-python@2.

[puremourning]

Still, you shouldn't be getting errors when using python 3 vim or runtime. I will try upgrading macvim and see what happens

[puremourning]

This is not a YCM issue.

I can reproduce with a completely different plugin using the following vimrc:

set rtp+=$HOME/.vim/bundle/vim-rtags
filetype plugin indent on

This should be reported upstream to either vim or macvim.

[puremourning]

The issue appears to be that python 3.7 is now issuing a deprecation warning for import that is done by vim's if_python3.c.

It can be reproduced with vim -Nu NONE --cmd 'py3 import sys'

BenMBP:vim ben$ tvim -Nu NONE --cmd 'py3 import sys'
Error detected while processing pre-vimrc command line:
/must>not&exist/foo:1: DeprecationWarning: the imp module is deprecated in favour of importlib; see the module's documentation for alternative uses
Press ENTER or type command to continue
BenMBP:vim ben$

[puremourning]

https://github.com/vim/vim/issues/3117

[cxwx]

may be it is time for youcompleteme to use python3 as default interpreter. since ubuntu18.04 use python3 as default python.

[puremourning]

That's completely irrelevant? This only happens (completely independently of YCM) if you compile Vim with Python 3, so I don't see what we could possibly change that would affect that.

[puremourning]

strictly, python 3.7 where the module (used by Vim internals) is deprecated.

[tahseenjamal]

Way to suppress warning on Mac OSX

vim ~/.vim/bundle/YouCompleteMe/autoload/youcompleteme.vim

search for

exec s:python_until_eof

just before

from __future__ import unicode_literals

mentioned below prepend silent! before exec s:python_until_eof

 silent! exec s:python_until_eof
 from __future__ import unicode_literals
 from __future__ import print_function
 from __future__ import division

[puremourning]

That is not a solution.

[tahseenjamal]

@puremourning edited my comment

[puremourning]

Sure but putting ‘silent! py3 pass’ in your vimrc is a better workaround.

[tahseenjamal]

@puremourning did brew upgrade after which I removed that 'silent! ' from the file. And now it is working file. I hope things are sorted in other's vim also

[puremourning]

Vim was fixed a while ago.