jedi#auto_vim_configuration might not have been set before loading plugin. Therefore check if it was set.

after/syntax/python.vim

@@ -24,5 +24,5 @@ if g:jedi#show_call_signatures > 0 && has('conceal')
     else
         hi jediFunction term=NONE cterm=NONE ctermfg=6 guifg=Black gui=NONE ctermbg=0 guibg=Grey
         hi jediFat term=bold,underline cterm=bold,underline gui=bold,underline ctermbg=0 guibg=#555555
-    end
+    endif
 endif

autoload/jedi.vim

@@ -235,12 +235,12 @@ function! jedi#complete_string(is_popup_on_dot)
     if a:is_popup_on_dot && !(g:jedi#popup_on_dot && jedi#do_popup_on_dot_in_highlight())
         return ''
 
-    end
+    endif
     if pumvisible() && !a:is_popup_on_dot
         return "\<C-n>"
     else
         return "\<C-x>\<C-o>\<C-r>=jedi#complete_opened()\<CR>"
-    end
+    endif
 endfunction
 
 
@@ -248,7 +248,7 @@ function! jedi#complete_opened()
     if pumvisible() && g:jedi#popup_select_first && stridx(&completeopt, 'longest') > -1
         " only go down if it is visible, user-enabled and the longest option is set
         return "\<Down>"
-    end
+    endif
     return ""
 endfunction
 
@@ -317,7 +317,7 @@ function! s:init()
       if exists('g:jedi#'.key)
           echom "'g:jedi#".key."' is deprecated. Please use 'g:jedi#".val."' instead. Sorry for the inconvenience."
           exe 'let g:jedi#'.val.' = g:jedi#'.key
-      end
+      endif
   endfor
 
   for [key, val] in items(s:settings)
@@ -349,7 +349,7 @@ else
         echomsg "Error: jedi-vim requires vim compiled with +python"
     endif
     finish
-end
+endif
 
 
 "Python jedi_vim.jedi.set_debug_function(jedi_vim.print_to_stdout, speed=True, warnings=False, notices=False)

ftplugin/python/jedi.vim

@@ -36,12 +36,12 @@ if g:jedi#auto_initialization
     if g:jedi#auto_close_doc
         " close preview if its still open after insert
         autocmd InsertLeave <buffer> if pumvisible() == 0|pclose|endif
-    end
-end
+    endif
+endif
 
 if g:jedi#auto_vim_configuration
     setlocal completeopt=menuone,longest,preview
     if len(mapcheck('<C-c>', 'i')) == 0
         inoremap <C-c> <ESC>
-    end
-end
+    endif
+endif

plugin/jedi.vim

@@ -4,8 +4,7 @@
 " This part of the software is just the vim interface. The really big deal is
 " the Jedi Python library.
 
-
-if g:jedi#auto_vim_configuration
+if !exists("g:jedi#auto_vim_configuration") || g:jedi#auto_vim_configuration
     " jedi-vim doesn't work in compatible mode (vim script syntax problems)
     if &compatible
         set nocompatible