在python使用mqttshi将on_message函数中msg.topic和msg.payload的数据传到另一个文件的变量

import paho.mqtt.client as mqtt

def on_connect(client, userdata, flags, rc):
    print("Connected with result code: " + str(rc))

def on_message(client, userdata, msg):
    print(msg.topic + " " + str(msg.payload))

client = mqtt.Client()
client.on_connect = on_connect
client.on_message = on_message
client.connect('127.0.0.1', 1883, 600) # 600为keepalive的时间间隔
client.subscribe('fifa', qos=0)
client.subscribe('thth', qos=0)
client.loop_forever() # 保持连接

例如在上面的代码中将on_message的函数中msg.topic和msg.payload的数据传到另一个文件的变量中，请问有什么办法和方向吗？