unbound, python and conditional replies

def operate(id, event, qstate, qdata):
  if (event == MODULE_EVENT_NEW) or (event == MODULE_EVENT_PASS):
    name = qstate.qinfo.qname_str.rstrip('.')

    # Find out source IP address
    rl = qstate.mesh_info.reply_list
    while (rl):
      if rl.query_reply:
        q = rl.query_reply
        break
      rl = rl.next

    # Careful with this conditional
    try: addr = q.addr
    except NameError: addr = None

    if (addr == "192.168.1.13") and (name == "test.inbox2.eu"):

      msg = DNSMessage(qstate.qinfo.qname_str, RR_TYPE_A, RR_CLASS_IN, PKT_QR | PKT_RA | PKT_AA)
      if (qstate.qinfo.qtype == RR_TYPE_A) or (qstate.qinfo.qtype == RR_TYPE_ANY):
        msg.answer.append("%s 10 IN A %s" % (qstate.qinfo.qname_str, "192.168.1.254"))

      if not msg.set_return_msg(qstate):
        qstate.ext_state[id] = MODULE_ERROR
        return True

      qstate.return_msg.rep.security = 2
      qstate.return_rcode = RCODE_NOERROR
      qstate.ext_state[id] = MODULE_FINISHED
      return True

    # not the name we are interested in
    else:
      qstate.ext_state[id] = MODULE_WAIT_MODULE
      return True

  if event == MODULE_EVENT_MODDONE:
    qstate.ext_state[id] = MODULE_FINISHED
    return True

  qstate.ext_state[id] = MODULE_ERROR
  return True