Warning. If you wanted to use Pydantic-v2, but if you already installed onion-config package just by pip install -U onion-config command, and this will not install pydantic-settings. For this case, ...

'onion_config' is a python package that allows for easy configuration management. It allows for loading and validating configuration data from environment variables and config files in JSON ...

Python uses TOML, or Tom’s Obvious Minimal Language, as a configuration format (as in pyproject.toml), but doesn’t expose the ability to read TOML-format files as a standard library module ...