add a highlight to the break column in python files

configs/vimrc

@@ -107,7 +107,7 @@ if has("autocmd")
   " (use spaces instead of tabs (expandtab), uses 4 spaces for tabs (tabstop),
   " when auto-indenting, also use 4 spaces (shiftwidth), when deleting text, 4
   " spaces are a tab (softtabstop) and break the line at column 78 (textwidth))
-  au FileType python setlocal expandtab tabstop=4 shiftwidth=4 softtabstop=4 textwidth=78
+  au FileType python setlocal expandtab tabstop=4 shiftwidth=4 softtabstop=4 textwidth=78 colorcolumn=79
   
   " reStructured files follow python closely, but use 3 tab stops instead of 4
   au FileType rst setlocal expandtab tabstop=3 sw=3 sts=3 textwidth=78