h2c.py

import re

def replace_one_hex_with_chr(m):
  return str(unichr(int(m.group()[1:], 16)))

def replace_hex_with_chr(s):
  return re.sub(r'%[0-9A-Fa-f][0-9A-Fa-f]', replace_one_hex_with_chr, s)

if __name__ == '__main__':
  import sys, os
  if len(sys.argv) < 2:
    print 'Usage: %s <string>' % os.path.basename(sys.argv[0])
    print 'where <string> contains %xx hex escapes'
  else:
    print replace_hex_with_chr(sys.argv[1])