Oversimplified decorator for settings management (via environment variables) with built in dataclasses superpowers.

pip install dataclasses-settings -U

pip install git+https://github.com/shpaker/dataclasses-settings.git -U

1. Specify environments variables:

   export APP_PORT=8080
   export APP_DEBUG=yes
   export APP_RULESET_PATH=./ruleset.yaml

2. Define class for settings with defaults values:

   from pathlib import Path
   
   from dataclasses_settings import dataclass_settings
   
   @dataclass_settings(prefix="app_", frozen=True)
   class Settings:
       port: int
       debug: bool = False
       ruleset_path: Path = None

3. Check result:

   from dataclasses import asdict
   
   settings = Settings()
   settings_dict = asdict(settings)
   print(settings_dict)

   Output:

   {'debug': True, 'port': 8080, 'ruleset_path': PosixPath('ruleset.yaml')}

4. Also you can redefine some values in runtime and create new instance of Settings:

   settings = Settings(port=80)
   settings_dict = asdict(settings)
   print(settings_dict)

   Output:

   {'debug': True, 'port': 80, 'ruleset_path': PosixPath('ruleset.yaml')}

1. Should install python-dotenv:

   pip install python-dotenv

2. ... or you can install dataclasses-settings with dotenv extra-package:

   Directly from github:

   pip install git+https://github.com/shpaker/dataclasses-settings.git@dotenv#egg=dataclasses-settings[dotenv] -U"

3. Finally define settings with dotenv_path argument:

   @dataclass_settings(prefix="app_", dotenv_path=".env")
   class Settings:
       ...