List text files showing LFs and expanded tabs (was: Colorize expanded tabs)

[qwweeeit]

Hi Gene,
thank you for your reply, also if my post was meant to be only
an exercise to apply color to lfs and expanded tabs in listing
files and not to apply it to an editor.
However your comment has directed me to consider more
deeply other editors (I use kwrite).
I am inclined to change to vim but I haven't found the
vim module for python.
By the way I'm not sure that vim can display lfs and expanded
tabs in color!
Bye.