YouCompleteMe fails because of an ImportError: cannot import name 'urljoin'

[crapp]

Issue Prelude

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Issue Details

Since recently I can no longer use YouCompleteMe on Windows 10 with Vim 8. I get the following import error
ImportError: cannot import name 'urljoin'

I suppose this is related to this pull request https://github.com/Valloric/YouCompleteMe/pull/2578
Before this pull request I didn't have this problem.

:messages

Here is the complete messages command output

Traceback (most recent call last):
File "", line 24, in
File "C:\Users\christian\vimfiles\bundle\YouCompleteMe\autoload..python\ycm\setup.py", line 47, in SetUpYCM
from ycm.youcompleteme import YouCompleteMe
File "C:\Users\christian\vimfiles\bundle\YouCompleteMe\autoload..python\ycm\youcompleteme.py", line 41, in
from ycm.omni_completer import OmniCompleter
File "C:\Users\christian\vimfiles\bundle\YouCompleteMe\autoload..python\ycm\omni_completer.py", line 29, in
from ycm.client.base_request import BaseRequest, HandleServerException
File "C:\Users\christian\vimfiles\bundle\YouCompleteMe\autoload..python\ycm\client\base_request.py", line 31, in
from ycmd.utils import ToBytes, urljoin, urlparse
ImportError: cannot import name 'urljoin'
VIM - Vi IMproved 8.0 (2016 Sep 12, compiled Mar 21 2017 23:08:51)

Test import urljoin from within GVim

:python3 << EOF
from urllib.parse import urljoin
print(urljoin('http://test.com', 'foo'))
EOF
http://test.com/foo

As you can see I am able to import urljoin from urlbase from within GVim without a problem.
I really don't understand why urljoin wasn't imported by ycmd module.

Diagnostic data

Output of vim --version

VIM - Vi IMproved 8.0 (2016 Sep 12, compiled Mar 21 2017 23:08:51)
MS-Windows 32 Bit GUI Version mit OLE-Unterstützung
Inklusive der Korrekturen: 1-502
Übersetzt von appveyor@APPVYR-WIN
Riesige Version mit GUI. Ein- (+) oder ausschließlich (-) der Eigenschaften:
+acl +cryptv +find_in_path +listcmds +perl/dyn -sun_workshop +visual
+arabic +cscope +float +localmap +persistent_undo +syntax +visualextra
+autocmd +cursorbind +folding +lua/dyn -postscript +tag_binary +viminfo
+balloon_eval +cursorshape -footer +menu +printer +tag_old_static +vreplace
+browse +dialog_con_gui +gettext/dyn +mksession +profile -tag_any_white +wildignore
++builtin_terms +diff -hangul_input +modify_fname +python/dyn +tcl/dyn +wildmenu
+byte_offset +digraphs +iconv/dyn +mouse +python3/dyn -termguicolors +windows
+channel +directx +insert_expand +mouseshape +quickfix -tgetent +writebackup
+cindent -dnd +job +multi_byte_ime/dyn +reltime -termresponse -xfontset
+clientserver -ebcdic +jumplist +multi_lang +rightleft +textobjects -xim
+clipboard +emacs_tags +keymap +mzscheme/dyn +ruby/dyn +timers +xpm_w32
+cmdline_compl +eval +lambda +netbeans_intg +scrollbind +title -xterm_save
+cmdline_hist +ex_extra +langmap +num64 +signs +toolbar
+cmdline_info +extra_search +libcall +ole +smartindent +user_commands
+comments +farsi +linebreak +packages +startuptime +vertsplit
+conceal +file_in_path +lispindent +path_extra +statusline +virtualedit
System-vimrc-Datei: "$VIM\vimrc"
Benutzer-vimrc-Datei: "$HOME_vimrc"
zweite Benutzer-vimrc-Datei: "$HOME\vimfiles\vimrc"
dritte Benutzer-vimrc-Datei: "$VIM_vimrc"
Benutzer-exrc-Datei: "$HOME_exrc"
zweite Benutzer-exrc-Datei: "$VIM_exrc"
System-gvimrc-Datei: "$VIM\gvimrc"
Benutzer-gvimrc-Datei: "$HOME_gvimrc"
zweite Benutzer-gvimrc-Datei: "$HOME\vimfiles\gvimrc"
dritte Benutzer-gvimrc-Datei: "$VIM_gvimrc"
defaults file: "$VIMRUNTIME\defaults.vim"
System-Menü-Datei: "$VIMRUNTIME\menu.vim"
Übersetzt: cl -c /W3 /nologo -I. -Iproto -DHAVE_PATHDEF -DWIN32 -DFEAT_CSCOPE -DFEAT_NETBEANS_INTG -DFEAT_JOB_CHANNEL -DFEAT_XPM_W32 -DWINVER=0x500 -D_WIN32_WINNT=0x500 /Fo.\ObjGXOULYHTRZi386/ /MP -DHAVE_STDINT_H /Ox /GL -DNDEBUG /Zl /MT -DFEAT_OLE -DFEAT_MBYTE_IME -DDYNAMIC_IME -DFEAT_MBYTE -DFEAT_GUI_W32 -DFEAT_DIRECTX -DDYNAMIC_DIRECTX -DDYNAMIC_ICONV -DDYNAMIC_GETTEXT -DFEAT_TCL -DDYNAMIC_TCL -DDYNAMIC_TCL_DLL=\"tcl86.dll\" -DDYNAMIC_TCL_VER=\"8.6\" -DFEAT_LUA -DDYNAMIC_LUA -DDYNAMIC_LUA_DLL=\"lua53.dll\" -DFEAT_PYTHON -DDYNAMIC_PYTHON -DDYNAMIC_PYTHON_DLL=\"python27.dll\" -DFEAT_PYTHON3 -DDYNAMIC_PYTHON3 -DDYNAMIC_PYTHON3_DLL=\"python35.dll\" -DFEAT_MZSCHEME -I "C:\Program Files (x86)\Racket\include" -DMZ_PRECISE_GC -DDYNAMIC_MZSCHEME -DDYNAMIC_MZSCH_DLL=\"libracket3m_a0solc.dll\" -DDYNAMIC_MZGC_DLL=\"libracket3m_a0solc.dll\" -DFEAT_PERL -DPERL_IMPLICIT_CONTEXT -DPERL_IMPLICIT_SYS -DDYNAMIC_PERL -DDYNAMIC_PERL_DLL=\"perl524.dll\" -DFEAT_RUBY -DDYNAMIC_RUBY -DDYNAMIC_RUBY_VER=22 -DDYNAMIC_RUBY_DLL=\"msvcrt-ruby220.dll\" -DFEAT_HUGE /Fd.\ObjGXOULYHTRZi386/ /Zi
Linken: link /RELEASE /nologo /subsystem:windows /LTCG:STATUS oldnames.lib kernel32.lib advapi32.lib shell32.lib gdi32.lib comdlg32.lib ole32.lib uuid.lib /machine:i386 gdi32.lib version.lib winspool.lib comctl32.lib advapi32.lib shell32.lib /machine:i386 /nodefaultlib libcmt.lib oleaut32.lib user32.lib /nodefaultlib:lua53.lib /STACK:8388608 /nodefaultlib:python27.lib /nodefaultlib:python35.lib "C:\Tcl\lib\tclstub86.lib" WSock32.lib xpmx86\lib\libXpm.lib /PDB:gvim.pdb -debug

Output of YcmDebugInfo

Place the output here, or a link to a gist.

Contents of YCM, ycmd and completion engine logfiles

Include link here to a gist containing the entire logfiles for ycm, ycmd
and any completer logfiles listed by :YcmToggleLogs.

OS version, distribution, etc.

Windows 10 64bit
Python 3.5.2 32bit

[micbou]

You need to update the ycmd submodule. Run the command:

git submodule update --init --recursive

in YCM folder.

[crapp]

Sorry to have bothered you with something so simple. I am using vundle on all my Linux boxes which of course manages git submodules as well. For windows I am using pathogen with a simple update script and that script doesn't update the submodules as I have now realized.

Thank you!

[sehe]

@crapp Thanks nevertheless for reporting with all those details, because it made locating the issue so much easier (sadly still took ~30 minutes).

@micbou Is there a reason for install.py not to have this action/option? People will not realize there even are submodules, nor should they really have to. Also, git clean -dfx . before install.py doesn't DoTheRightThing(TM) in this situation.

[revolter]

@micbou That command is throwing an error:

error: Your local changes to the following files would be overwritten by checkout:
    build.py
    run_tests.py
Please commit your changes or stash them before you switch branches.
Aborting
Unable to checkout '13da3d47255d559308b946242e508d3531dabda5' in submodule path 'third_party/ycmd'

[micbou]

@revolter If you don't care about the changes made to these files, run again the command in YCM folder with the --force option:

git submodule update --init --recursive --force