Python: Facade Design Pattern

The facade is a part of the Gang of Four design pattern and it is categorized under Structural design patterns. Sometimes we have a system that becomes quite complex over time as more features are added or modified. It provides a simplified interface to a system, library, framework, or any other complex set of classes.

What problems does it solve?

• To make a complex subsystem easier to use, a simple interface should be provided for a set of interfaces in the subsystem.
• The dependencies on a subsystem should be minimized.

The three components of the Facade Pattern:

• System class — The sub-systems have complexity.
• Facade class — Unified and user-friendly interface.
• Client — Classes that use Facade class to access the functionality of the system.

UML Diagram

System flow diagram