Decode Characters in Python

class CP037Decoder:
  _CHARSET_ = 'cp037'
  def __init__(self, message):
    self.decode_message = unicode(message, self._CHARSET_)

  def show_in_utf8(self):
    print self.decode_message.encode('utf8')

if __name__ == '__main__':
  msg_file = open(sys.argv[1], 'r')
  CP037Decoder(msg_file.read()).show_in_utf8()
  msg_file.close()