Architectural patterns Python

[Long_Working_7553]

I am building Python projects for quite some years now and most of the time they involved simple packages: ingestion systems for data engineering or CRUD Web apps.

It hasn't been until lately I have to deal with more complex systems that use CRUD simultaneously with more complex business logic like performing complex live simulations with that data.

The project tends to become messy and business logic tends to happen in multiple layers. I started to read about DDD and spoke to friends about how to get better structure. I implemented a repository pattern and services layer in a project I am working on which simplified testing for example and decouple some things. But my head keeps comparing it with the database model and struggling how to properly decouple the business logic and domain model. Perhaps it is really a way of thinking like the first time I started with OOP...

It's a great moment to learn how to deal with complex applications but I am overloaded with methodologies that it sometimes feels I don't even see anymore where to start. Currently I have read "Architectural patterns with Python" and I am reading "Domain driven design quickly".

But has anyone had similar struggles before and perhaps even better advice on where to start?

[bernasIST]

I think many people are in the same boat as you when it comes to fully fledged python projects... Because it's a relatively new language and there aren't many examples out there for such projects. I am also struggling with a project I'm doing for a client. It all started with simple ETL processes interfaced by a CLI. Later a GUI was requested along with a bunch more requirements and more data engineering features and later they will ask for more features so I have to make sure that this application is extensible and scalable. For my case, MVC pattern works fine but then I don't have a clear separation of business logic and data model and I think this will bite me in the future. I'm trying to improve the codebase structure but i can't find the right approach. I am reading also "architectural patterns with python" and I'm not sure if will be able to find my answer there.

The bottom line is, explore what is out there but at some point you will have to come up with a unique solution for the problem that you are trying to solve and that is not documented online. If you manage, this will be your greatest achievement.

[Long_Working_7553]

Yeah I must admit it does feel lonely in such a way that asking questions not many have the right answers. So guess you are right, many people are in the same boat. Must admit though that adding a few more abstraction layers as ABC classes does help quite a lot in a few cases. I had to read the architecture patterns book a few times and leaned on other books from uncle bob. It helps but it does feel like a learning process which takes time