publish-subscribe pattern subscriber py from xmlrpc client import serverproxy from xmlrpc server import simplexmlrpcserver class subscriber(simplexmlrpcserver)def __init__(selfdispatchertopic)super(subscriberself__init__(("localhost" )print("listening on port "self register_function(self process"process"self subscribe(dispatchertopicdef subscribe(selfdispatchertopic)with serverproxy(dispatcheras dispatchdispatch subscribe(def process(selfmessage)print("message{}format(message get("payload""default message"))return "okdef main()subscriber_server subscriber(subscriber_server serve_forever(if __name__ ="__main__"main(to run the program and see its true effectsyou have to open three terminal windows and activate the virtual environment for your code in each of the windows we will run each part of the application in its own window to simulate the interaction between independent systems each command that follows assumes that the virtualenv is already activated window dispatcher python dispatcher py window subscriber python subscriber py