Use pydantic for easy runtime data validation #734
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Python 3.10 has a nice syntax features for type annotations, such as `|` unions, and 3.9 will be end of life by the end of 2025. Pydantic has been added to allow runtime type checking.
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I've found writing more data oriented python has made my projects less bug prone and easily maintainable. Pydantic is a very popular library that can provide runtime data validation from standard type hints.
This PR shows how Pydantic could be introduced incrementally. I've used the
@validate_calldecorator to check the arguments provided tounique_dirs. I've also madeLibrarya data class with runtime type checking on initialization and assignment. (I normally like to usefrozen=True, but was trying to keep changes to a minimum.)I have also bumped the python version to 3.10. I chose 3.10 because it adds nice ergonomic improvements to type hints, e.g.
str | listas oppose toUnion[str, list]. Version 3.9 will also become end-of-life before the end of the year. The latest Pydantic only requires python version 3.8, though so we don't have to jump to 3.10 in order to use it.