Displaying emonPi data on PaPiRus Zero

papirus-emonpi.py

#!/usr/bin/env python

import os
import sys
import mosquitto
import time
from datetime import datetime
from papirus import Papirus
from PIL import Image
from PIL import ImageDraw
from PIL import ImageFont

user = os.getuid()
if user != 0:
    print "Please run script as root"
    sys.exit()

papirus = Papirus()

ct1_value = "0"
ct2_value = "0"
ct1_prev_value = "0"
ct2_prev_value = "0"

previous_second = 0

def on_message(mosq, obj, msg):
    global ct1_value, ct2_value, ct1_prev_value, ct2_prev_value

    if msg.topic == "emon/emonpi/power1":
        ct1_value = str(msg.payload)
    if msg.topic == "emon/emonpi/power2":
        ct2_value = str(msg.payload)
    
    if ct1_value != ct1_prev_value or ct2_value != ct2_prev_value:
        ct1_prev_value = ct1_value
        ct2_prev_value = ct2_value

        display_data()

def display_data():
    global ct1_value, ct2_value, previous_second

    now = datetime.today()

    image = Image.new('1', papirus.size, 1)
    draw = ImageDraw.Draw(image)

    font_path = "/usr/share/fonts/truetype/dejavu/DejaVuSans-Bold.ttf"
    font_title = ImageFont.truetype(font_path, 20)
    font_values = ImageFont.truetype(font_path, 15)

    draw.text( (0, 0) , "emonPi", font=font_title, fill=0)
    draw.text( (0, 1) , "_________", font=font_title, fill=0)
    draw.text( (0, 30) , "CT1: " + ct1_value + "W", font=font_values, fill=0)
    draw.text( (0, 50) , "CT2: " + ct2_value + "W", font=font_values, fill=0)
    draw.text( (0, 75) , "Total: " + str(int(ct1_value) + int(ct2_value)) + "W", font=font_values, fill=0)

    papirus.display(image)

    if now.second < previous_second:
        papirus.update()
    else:
        papirus.partial_update()

    previous_second = now.second

def get_ip_address():
    return os.popen("ifconfig wlan0 | grep 'inet addr' | awk -F: '{print $2}' | awk '{print $1}'").read().strip()

def main():
    client = mosquitto.Mosquitto()
    client.on_message = on_message
    client.username_pw_set("emonpi", "emonpimqtt2016")
    client.connect("192.168.0.123", 1883, 60)
    client.subscribe([("emon/emonpi/power1", 2), ("emon/emonpi/power2", 2)])

    while 1:
        client.loop()

    return 0

if __name__ == "__main__":
    sys.exit(main())

why don't you use paho-mqtt?
This repository uses it.
https://raw.githubusercontent.com/DesignSparkrs/papirus/master/mqttPapirus