Listener for Python Queue

Question

I'm using python queue to insert data packets from mqtt listeners But I'm not sure when this queue will be loaded by Mqtt packet.

Can we put a listener on to this Queue ?

note : This listener callback will be used to insert the data in to DataBase.

import queue
import time
import threading

print('python queue')



def on_connect():
    print('connected')

# gives message from device
def on_message(client,userdata,msg):
    #print("Topic",msg.topic + "\nMessage:" + str(msg.payload)
    qMqtt.put('msg')
    #replace below line from here and move to listener   
    queueToDB('msg')
   
def queueToDB(msg):
    qMqtt.get(msg)
    dbaseInsert(msg)

def dbaseInsert(data):
    #insert into query
    print("inserted")
       
def run():
    #mqttc= mqtt.Client()
    
    #mqttc.on_connect=on_connect
    #mqttc.on_message=on_message
    
    global qMqtt
    qMqtt = queue.Queue()
    on_connect()
    on_message('client','userdata','msg')

run()