Can you explain the main principles of building software system architecture?

The main principles of building software system architecture include:

• Modularity — dividing the system into independent modules that can be developed, tested, and maintained separately.
• Abstraction — hiding implementation details and providing a simple interface for interaction.
• Separation of Concerns — each module or component is responsible for its part of the functionality.
• Reusability — creating components that can be used in different parts of the system or in different projects.
• Extensibility — the ability to add new functionality without changing existing code.
• Maintainability — the architecture should facilitate fixing errors and updating the system.
• Performance and Scalability — the architecture should ensure efficient operation and the ability to grow.

In Python, these principles are implemented through the use of packages, modules, classes, as well as design patterns such as MVC, MVP, or microservice architecture for large systems.