Python 在使用AES解码时，如何在没有额外更改的情况下获得正确的消息？

我正在尝试对MQTT应用程序使用使用pyaes的AES加密。在解码过程中，我用b'Message'而不仅仅是Message来获取输入。如何确保信息打印出来？微调和变速功能不工作

import time
import paho.mqtt.client as mqtt
import os
import pyaes
import sys

# This is the Subscriber

def on_connect(client, userdata, flags, rc):
  print("Connected with result code "+str(rc))
  client.subscribe("topic/test")

def on_message(client, userdata, msg):
    #keys = os.urandom(16)
    #iv   = os.urandom(16)

    keys = //Random Keys
    iv   = //Random IV Key
    bart = pyaes.AESModeOfOperationOFB(keys,iv=iv)

    decrypted = bart.decrypt(msg.payload)
    #print(msg.payload,"\n")
    print("Message is : ",decrypted,"\n")
    client.disconnect()

broker      = "192.168.1.104"
port        = 1883
keepalive   = 60

client = mqtt.Client()
client.connect(broker,port,keepalive)

client.on_connect = on_connect
client.on_message = on_message

client.loop_forever()

输出消息打印出来：b'这是消息'

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我更希望打印输出：这是一条信息

您应该熟悉基本的Python数据类型，特别是

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：您应该熟悉基本的Python数据类型，特别是

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：