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

[qwweeeit]

Hi all,
in a previous post I asked help for colorizing expanded tab.
I wanted to list text files showing in colors LFs and the expanded
tabs.
I hoped to use only bash but, being impossible, I reverted to Python.
I programmed a very short script .
Here it is (... and I ask comments or critics):

# for Linux users
# starting from a list of all the lines of a text files (lFileList)

nNP=9       # n. of Not Printables characters
for line in lFileList:
    nTab= line.count('\t')
    if nTab > 0:
         for i in range(nTab):
             nPosTab=line.find('\t')
             line=line.replace('\t',"\033[41m"+\
                  (8-(nPosTab-(nNP*i))%8)*' '+"\033[0m",1)
    print line.replace('\n',"\033[7m \033[0m\n"),
print

The Linux users can also use piping.
For example:
    python lft.py lft.py|grep range

correctly displays:
          for i in range(nTab):
+ the mark of the LF (a small white rectangle)
 
Bye.