loop forever python paho

def run():
        # Mqtt
        client = mqtt.Client()
        client.on_connect = on_connect
        client.on_message = on_message
        client.username_pw_set("/virtualhost:username", "password")
        client.connect("rmqserver", port, 60)
        client.loop_forever()

try:
    run()
except:
    print("connection failed")
    time.sleep(45)
    run()