make use of tab (unless python or doctest)

.vimrc

@@ -1,15 +1,17 @@
 set laststatus=2
+set encoding=utf-8
+set autoindent
+
 filetype indent plugin on
-" show existing tab with 4 spaces width
+
+" Global tab settings
 set tabstop=4
-" when indenting with '>', use 4 spaces width
 set shiftwidth=4
-" On pressing tab, insert 4 spaces
+set softtabstop=4
 set expandtab
-" hilight tab
-highlight SpecialKey ctermfg=1
-set list
-set listchars=tab:T>
+
+" Set to show invisibles (tabs & trailing spaces) & their highlight color
+set list listchars=tab:»\ ,trail:·
 
 set number
 
@@ -47,5 +49,7 @@ function SetGPGOptions()
     set foldopen=insert
 endfunction
 
-" Set to show invisibles (tabs & trailing spaces) & their highlight color
-set list listchars=tab:»\ ,trail:·
+if has("autocmd")
+    " Set filetype tab settings
+    autocmd FileType python,doctest set ai ts=4 sw=4 sts=4 et
+endif