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Python Execution

Flask

Flask + Postgres

Python Test

Clean architecture is a software design methodology that separates the processes of an application into discrete steps instead of presenting them as “spaghetti code.” With the versatility of Python, software engineers can build performant, modular applications quickly using the Flask framework.

This course will help you build better applications using the principles of clean architecture. You’ll start with an introduction to data flow in clean systems and learn about the advantages of layered architectures. Next, you’ll learn system components and the connections between application layers. You’ll then design and build a clean system using Python by layering components in guided coding exercises. Finally, you’ll learn how to add functional components for the web, handle errors, and work with external databases using both Postgres and MongoDB. At each step, you’ll use test-driven development practices to ensure robust functionality.

Clean Architecture in Python

## The purpose of layers

As we move deeper into each layer in clean architecture, its content becomes more abstract. The inner layers contain representations of business concepts, while the outer layers contain specific details about real-life implementation. The communication between elements that live in the same layer is unrestricted. Still, when we want to communicate with elements that have been assigned to other layers, its important to follow one simple rule. If we’d like, we can refer to this as a golden rule. It’s one of the most important things in clean architecture and may even be considered to be its core expression.

The golden rule: Talk inward with simple structures, talk outward through interfaces.

## Communication behavior

Our elements should talk inward. This means they should pass data to more abstract elements through the use of basic structures, entities, and so on.

# The purpose of layers

As we move deeper into each layer in clean architecture, its content becomes more abstract. The inner layers contain representations of business concepts, while the outer layers contain specific details about real-life implementation. The communication between elements that live in the same layer is unrestricted. Still, when we want to communicate with elements that have been assigned to other layers, its important to follow one simple rule. If we’d like, we can refer to this as a golden rule. It’s one of the most important things in clean architecture and may even be considered to be its core expression.

The golden rule: Talk inward with simple structures, talk outward through interfaces.

# Communication behavior

Our elements should talk inward. This means they should pass data to more abstract elements through the use of basic structures, entities, and so on.

Let’s learn about how communication is done between the layers of clean architecture.

Get Started

A Day in the Life of a Clean System

Components of Clean Architecture

A Simple Coding Example

Add a Web Application

Error Management

Integration with a Real External System Postgres

Integration with a Real External System MongoDB

Run a Production-ready System

Appendix

Communication Between Layers

The purpose of layers

Communication behavior