Design Patterns with Python Examples - Part 3 - The Facade Pattern in Python

17 Mar, 2026

Overview: The Facade pattern provides a simplified interface to a complex subsystem, hiding underlying complexity.

Example Use Case: A home theater system that wraps multiple components (projector, speakers, lights) under a single interface.

class Projector:
    def on(self): print("Projector on")
    def off(self): print("Projector off")

class Lights:
    def dim(self): print("Lights dimmed")
    def on(self): print("Lights on")

class Speakers:
    def play_sound(self): print("Speakers playing sound")

class HomeTheaterFacade:
    def __init__(self):
        self.projector = Projector()
        self.lights = Lights()
        self.speakers = Speakers()

    def watch_movie(self):
        print("Getting ready to watch a movie...")
        self.lights.dim()
        self.projector.on()
        self.speakers.play_sound()

    def end_movie(self):
        print("Shutting down movie system...")
        self.projector.off()
        self.lights.on()

home_theater = HomeTheaterFacade()
home_theater.watch_movie()
home_theater.end_movie()

Why it’s useful: Reduces coupling between clients and complex systems, making code easier to maintain.