1.py

topic = "user/path/topic"

2.py

from pubnub.pnconfiguration import PNConfiguration
from pubnub.pubnub import PubNub
from pubnub.callbacks import SubscribeCallback

pnconfig = PNConfiguration()
pnconfig.subscribe_key = "my_subkey"
pnconfig.publish_key = "my_pubkey"
pnconfig.ssl = False
 
pubnub = PubNub(pnconfig)

class MySubscribeCallback(SubscribeCallback):
   def presence(self, pubnub, presence):
       pass  # handle incoming presence data
   def status(self, pubnub, status):       
   def message(self, pubnub, message):
        print(message)
    
pubnub.add_listener(MySubscribeCallback())
pubnub.subscribe().channels('my_channel')async(callback).execute()

3.py

import paho.mqtt.client as mqtt

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

def on_connect(client, userdata, flags, rc):
    client.subscribe('my_topic')

client = mqtt.Client()
client.on_message = on_message
client.on_connect = on_connect
client.connect('mqtt.pubnub.com', 1883)
client.loop_forever()