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#!/usr/bin/env python
import paho.mqtt.client as mqtt
import RPi.GPIO as GPIO
def on_connect(client, userdata, rc):
#print ("Connected with rc: " + str(rc))
def on_message(client, userdata, msg):
#print ("Topic: "+ msg.topic+"\nMessage: "+str(msg.payload))
if "green" in msg.payload:
#print(" Green on!")
GPIO.output(11, True)
#print(" Green off!")
GPIO.output(11, False)
if "yellow" in msg.payload:
#print(" Yellow on!")
GPIO.output(12, True)
#print(" Yellow off!")
GPIO.output(12, False)
if "red" in msg.payload:
#print(" Red on!")
GPIO.output(13, True)
#print(" Red off!")
GPIO.output(13, False)
client = mqtt.Client()
client.on_connect = on_connect
client.on_message = on_message
client.connect("", 1883, 60)
GPIO.setup(11, GPIO.OUT)
GPIO.setup(12, GPIO.OUT)
GPIO.setup(13, GPIO.OUT)

There is a small change in your, This function requires 4 arguments.
Change this:
def on_connect(client, userdata, rc):

To this:
def on_connect(client, userdata, flag, rc):

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