Tern mixing site-packages from different python versions

[tony]

3cffc28

If I'm in a virtual environment for Python 2, tern_for_vim will use urllib from the system's site packages (potentially Python 3), while attempting to access http from the virtual environment's pats.

Error detected while processing /Users/me/.dot-config/.vim/plugged/tern_for_vim/autoload/tern.vim:
line    9:
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/Users/me/.dot-config/.vim/plugged/tern_for_vim/script/tern.py", line 8, in <module>
    from urllib import request
  File "/usr/local/Cellar/python/3.6.4_4/Frameworks/Python.framework/Versions/3.6/lib/python3.6/urllib/request.py", line 88, in <module>
    import http.client
  File "snip/.venv/lib/python2.7/site-packages/http/__init__.py", line 7, in <module>
    raise ImportError('This package should not be accessible on Python 3. '
ImportError: This package should not be accessible on Python 3. Either you are trying to run from the python-future src folder or your installation of python-future is corrupted.

To recreate this, have Python 3 as default system interpreter, then Python 2 as a virtual environment. And be inside the virtual environment. And python-mode/python-mode.

Then open a Python file. Then try to open any JS file.

.venv ❯ vim --version
VIM - Vi IMproved 8.0 (2016 Sep 12, compiled Mar 13 2018 06:36:50)
macOS version
Included patches: 1-1600
Compiled by Homebrew
Huge version without GUI.  Features included (+) or not (-):
+acl               +farsi             +mouse_sgr         -tag_any_white
+arabic            +file_in_path      -mouse_sysmouse    -tcl
+autocmd           +find_in_path      +mouse_urxvt       +termguicolors
-autoservername    +float             +mouse_xterm       +terminal
-balloon_eval      +folding           +multi_byte        +terminfo
+balloon_eval_term -footer            +multi_lang        +termresponse
-browse            +fork()            -mzscheme          +textobjects
++builtin_terms    -gettext           +netbeans_intg     +timers
+byte_offset       -hangul_input      +num64             +title
+channel           +iconv             +packages          -toolbar
+cindent           +insert_expand     +path_extra        +user_commands
-clientserver      +job               +perl              +vertsplit
+clipboard         +jumplist          +persistent_undo   +virtualedit
+cmdline_compl     +keymap            +postscript        +visual
+cmdline_hist      +lambda            +printer           +visualextra
+cmdline_info      +langmap           +profile           +viminfo
+comments          +libcall           -python            +vreplace
+conceal           +linebreak         +python3           +wildignore
+cryptv            +lispindent        +quickfix          +wildmenu
+cscope            +listcmds          +reltime           +windows
+cursorbind        +localmap          +rightleft         +writebackup
+cursorshape       -lua               +ruby              -X11
+dialog_con        +menu              +scrollbind        -xfontset
+diff              +mksession         +signs             -xim
+digraphs          +modify_fname      +smartindent       -xpm
-dnd               +mouse             +startuptime       -xsmp
-ebcdic            -mouseshape        +statusline        -xterm_clipboard
+emacs_tags        +mouse_dec         -sun_workshop      -xterm_save
+eval              -mouse_gpm         +syntax
+ex_extra          -mouse_jsbterm     +tag_binary
+extra_search      +mouse_netterm     +tag_old_static
   system vimrc file: "$VIM/vimrc"
     user vimrc file: "$HOME/.vimrc"
 2nd user vimrc file: "~/.vim/vimrc"
      user exrc file: "$HOME/.exrc"
       defaults file: "$VIMRUNTIME/defaults.vim"
  fall-back for $VIM: "/usr/local/share/vim"
Compilation: clang -c -I. -Iproto -DHAVE_CONFIG_H   -DMACOS_X -DMACOS_X_DARWIN  -g -O2 -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1
Linking: clang   -L. -fstack-protector -L/usr/local/lib -L/usr/local/opt/libyaml/lib -L/usr/local/opt/openssl/lib -L/usr/local/opt/readline/lib  -L/usr/local/lib -o vim        -lncurses -liconv -framework AppKit   -mmacosx-version-min=10.13 -fstack-protector-strong -L/usr/local/lib  -L/usr/local/Cellar/perl/5.26.1/lib/perl5/5.26.1/darwin-thread-multi-2level/CORE -lperl -lm -lutil -lc  -L/usr/local/opt/python/Frameworks/Python.framework/Versions/3.6/lib/python3.6/config-3.6m-darwin -lpython3.6m -framework CoreFoundation  -lruby.2.5.0 -lobjc

venv:

Python 2.7.10

system python 3

Python 3.6.4

Expected behavior: tern_for_js should be using the same site-packages (one way or another)

I'm not quite sure how this is happening. It may have to do with having vim installed with +python3.

[othree]

This plugin use Vim's Python integration feature. So if you want to use python 2 to run the script. Vim most have +python flag. Your vim is using +python3, not +python.