settings.py

import importlib
import os


SETTINGS_MODULE = os.environ('SETTINGS_MODULE')


class Borg:
    _shared_state = {}

    def __init__(self):
        self.__dict__ = self._shared_state


class Settings(Borg):
    settings_module = None

    def __init__(self):
        super().__init__()
        settings_module = importlib.import_module(SETTINGS_MODULE)

        for setting in dir(settings_module):
            if setting.isupper() and not getattr(self, setting):
                setattr(self, setting, getattr(settings_module, setting))

    def assert_settings_errors(self):
        raise NotImplementedError


settings = Settings()