Cleaned up the mess with virtualenv-specific ctags.

vimrc

@@ -81,18 +81,15 @@ let g:Powerline_colorscheme = 'skwp'
 " ctags for system Python and for virtual environments
 let base_ctags_path = $HOME . "/.vim/tags/python.ctags"
 exec 'set tags+=' . base_ctags_path
+" location of site-packages (virtualenv-aware)
+let site_packages = system('python -c "import sys; from distutils.sysconfig import get_python_lib; sys.stdout.write(get_python_lib())"')
 if !empty($VIRTUAL_ENV)
-    let ctags_path = $VIRTUAL_ENV . "/python.ctags"
-    if filereadable(ctags_path)
-        exec 'set tags+=' . ctags_path
-    endif
-else
-    let ctags_path = base_ctags_path
+    " if we are in a virtualenv, create local ctags file and add it to tags
+    let local_ctags_path = $VIRTUAL_ENV . "/python.ctags"
+    exec 'silent !ctags -R -f' local_ctags_path site_packages
+    exec 'set tags+=' . local_ctags_path
 endif
 
-let ctags_src = system('python -c "import sys; from distutils.sysconfig import get_python_lib; sys.stdout.write(get_python_lib())"')
-exec 'map <Leader>t :!ctags -R -f' ctags_path ctags_src . '<CR>'
-
 python << EOF
 import os
 import sys