conf.py

from typing import Any
from typing import Mapping

import hcl
from immutables import Map
from typing_extensions import Final


class Settings:
    __frozen = False

    def __init__(self, config: Mapping[str, Any]) -> None:
        self.__mapping: Map[str, Any] = Map(
            {k: Settings(v) if isinstance(v, Mapping) else v for k, v in config.items()}
        )
        self.__dict__ = {**self.__mapping, **self.__dict__}
        self.__frozen = True

    def __repr__(self) -> str:
        return repr(self.__mapping)

    def __getattr__(self, item):
        if item == "__frozen":
            return self.__frozen
        try:
            return self.__mapping[item]
        except KeyError:
            raise AttributeError(f"'Settings' object has no attribute '{item}'")

    def __setattr__(self, key, value):
        if self.__frozen:
            raise TypeError(f"Can't set attribute '{key}' on 'Settings' object")
        super().__setattr__(key, value)


def from_file(path) -> Settings:
    with open(path, "r") as f:
        return Settings(hcl.loads(f.read()))


settings: Final = from_file("config.hcl")

requirements.txt

typing-extensions
immutables
pyhcl