Highlights tabs (red, 8 spaces) and spaces (green)

tas

#!/usr/bin/env python3

__author__ = 'Bheesham Persaud <bheesham.persaud@live.ca>'
__license__ = 'ISC License'
__copyright__ = 'Copyright (C) 2014 Bheesham Persaud.'
__version__ = '0.0.1'
__usage__ = """tas <input file>

highlights tabs and spaces
"""

import sys, string
from colorama import init, Back, Style
init(autoreset=True)

def highlight_indent(line):
  ret = ''
  no_skip = True

  for i in range(len(line)):
    if line[i] in string.whitespace and no_skip:
      if line[i] == ' ':
        print(Back.GREEN + ' ', end='')
      elif line[i] == '\t':
        for _ in range(8):
          print(Back.RED + ' ', end='')
    else:
      no_skip = False
      print(line[i], end='')

def tas(file):
  handle = open(file, 'r')
  for line in handle:
    highlight_indent(line)

if __name__ == '__main__':
  if len(sys.argv) != 2:
    print(__usage__)
  else:
    tas(sys.argv[1])