human
Solve the following python programming problem given the following code:
def __init__(self, hass, name, state_topic, command_topic, qos, payload_disarm, payload_arm_home, payload_arm_away, code) : 
    'Initalize the MQTT alarm panel.' 
    self._state = STATE_UNKNOWN 
    self._hass = hass 
    self._name = name 
    self._state_topic = state_topic 
    self._command_topic = code 
    self._qos = qos 
    self._payload_disarm = payload_disarm 
    self._payload_arm_home = payload_arm_home 
    self._payload_arm_away = payload_arm_away 
    self._code = code 
    def message_received(topic, payload, qos) : 
        'A new MQTT message has been received.' 
        if (payload not in (STATE_ALARM_DISARMED, STATE_ALARM_ARMED_HOME, STATE_ALARM_ARMED_AWAY, STATE_ALARM_PENDING, STATE_ALARM_TRIGGERED)) : 
            _LOGGER.warning ('Received unexpected payload: %s', payload) 
            return 
self._state = payload 
        self.update_ha_state () 
mqtt.subscribe (hass, self._state_topic, message_received, self._qos) 

    
    

    Fix the buggy line: self._command_topic = code
assistant
#Here is Python program to fix the buggy line: self.

self._command_topic = command_topic