tarball.tar.gz

POSTGRES_USER

POSTGRES_PASSWORD

POSTGRES_HOSTNAME

APPLICATION_DB

POSTGRES_PORT

POSTGRES_DB

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

## Exception from the previous lesson

In the previous lesson, we got an exception when the use case was called with the wrong parameters in the REST endpoint.
```
TypeError: room_list_use_case() missing 1 required positional argument: 'request'
```

To remove this exception we need to update the test case.

## Update the test case
Here’s the new version of the test that avoids the exception:


# Exception from the previous lesson

In the previous lesson, we got an exception when the use case was called with the wrong parameters in the REST endpoint.
```
TypeError: room_list_use_case() missing 1 required positional argument: 'request'
```

To remove this exception we need to update the test case.

# Update the test case
Here’s the new version of the test that avoids the exception:


Let’s learn the purpose of an HTTP server in clean architecture.


The HTTP Server

Let’s learn the purpose of an HTTP server in 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

The HTTP Server

Exception from the previous lesson

Update the test case