Facade pattern

Key 6: Hiding system complexity for a simpler interface.

In this pattern, a main class called facade exports a simpler interface to client classes and encapsulates the complexity of interaction with many other classes of the system. It is like a gateway to a complex set of functionality, such as in the following example, the WalkingDrone class hides the complexity of synchronization of the Leg classes and provides a simpler interface to client classes:

class Leg(object):
    def __init__(self,name):
        self.name = name

    def forward(self):
        print("{0},".format(self.name), end="")


class WalkingDrone(object):

    def __init__(self, name):
        self.name = name
        self.frontrightleg = Leg('Front Right Leg')
        self.frontleftleg = Leg('Front Left Leg')
        self.backrightleg = Leg('Back Right Leg')
        self.backleftleg = Leg('Back Left Leg')

    def walk(self):
        print("\nmoving ",end="")
        self.frontrightleg.forward()
      ...