gistfile1.txt

#!/usr/bin/python
#! -*- coding: utf-8 -*-

import re

f = open("access.log", "r")
text = f.read()
f.close()

ipv6_find = re.compile('(^|\n)' +\
                       '(([0-9a-fA-F]{1,4}:){7,7}[0-9a-fA-F]{1,4}|' +\
                       '([0-9a-fA-F]{1,4}:){1,7}:|' +\
                       '([0-9a-fA-F]{1,4}:){1,6}:[0-9a-fA-F]{1,4}' +\
                       '|([0-9a-fA-F]{1,4}:){1,5}(:[0-9a-fA-F]{1,4}){1,2}|' +\
                       '([0-9a-fA-F]{1,4}:){1,4}(:[0-9a-fA-F]{1,4}){1,3}|' +\
                       '([0-9a-fA-F]{1,4}:){1,3}(:[0-9a-fA-F]{1,4}){1,4}|' +\
                       '([0-9a-fA-F]{1,4}:){1,2}(:[0-9a-fA-F]{1,4}){1,5}|' +\
                       '[0-9a-fA-F]{1,4}:((:[0-9a-fA-F]{1,4}){1,6})|' +\
                       ':((:[0-9a-fA-F]{1,4}){1,7}|:)) ')

count_ipv6 = len(re.findall(ipv6_find, text))

f = open("output.txt", "w")
text = f.write(str(count_ipv6))
f.close()