I have been surveying Python class definition systems for awhile and yesterday I watched a webcast of Param and was very impressed. Param is the bottom floor of a very impressive data science / web application development stack that has 100% support from Anaconda. Param was developed for over 10 years in academia.
What other powerful object systems are there besides Param? Pydantic
Pydantic is quite popular but lacks the reactive capabilities that Param, Atom, Traits and Traitlets have. It also is more about type conversion than validation (according to yesterday’s webinar). There is quite a bit of tooling around Pydantic in the form of Pydantic settings (for configuring apps), Pydantic-CLI (and Typer) for command-line interfaces, and Pydantic-SQLAlchemy to make using SQLAlchemy even easier. And FastAPI appears to use it under the hood. And FastAPI is the 3rd most popular web framework in Python behind Django and Flask.
So while numerous object systems are more featureful than Pydantic, another one is much faster
Final Mention for now – CubicWeb
CubicWeb is another object system that comes with a massive infrastructure around it. Even though you define classes similar to these other libraries, are you actually creating a UML relational structure which pumps out CRUD apps and has been doing so for over a decade!