visitor pattern want to believe -- -files since python can be found in many placesyou might one day want to do little bit of home automation get couple of single-board and micro computers and connect them to some hardware sensors and actuatorsand soon you have network of devicesall controlled by you each of these items in the network has its own functionalityand each performs different interactions like metering the light levels in the homeor checking the temperature you could encapsulate the functionality of each device as an object in virtual network that matches the physical wired networkthen treat the whole system like you would any other network of objects this will focus on that side of the implementationassuming all the elements have already been wired up and are modeled as objects in the system the network in our simulation will have the following componentsthermostat temperature regulator front door lock coffee machine bedroom lights kitchen lights clock suppose each object class has the functionality to check the status of the device it is connected to these return different values lights might return for "the lights are onand for "the lights are off,and an error message- when the lights controller (cwessel badenhorst badenhorstpractical python design patterns