import webcolors

import re

import fileinput

import sys

def to_gray(hex_str):

return h

def regex_replace(match):

hex_color = match.group(2) if "#" in match.group(2) else webcolors.name_to_hex(match.group(2))

return match.group().replace(match.group(2), to_gray(hex_color))

for line in fileinput.input([sys.argv[1]], inplace=True, backup='.bak'):

print re.sub(r'(fill|stroke|color)="([^"]+)"', regex_replace, line).replace("\n", "")