Using lazy settings in django apps

conf.py

# myapp/conf.py

from core.settings import Settings

DEFAULTS = {
    'TEMP_DIR': '/tmp/'
}

settings = Settings(DEFAULTS)

settings.py

# core/settings.py

from django.conf import settings


class Settings:
    """
    Lazy settings wrapper, for use in app conf.py files
    """
    def __init__(self, defaults):
        """
        Constructor

        :param defaults: default values for settings, will be return if
                         not overridden in the project settings
        :type defaults: dict
        """
        self.defaults = defaults

    def __getattr__(self, name):
        """
        Return the setting with the specified name, from the project settings
        (if overridden), else from the default values passed in during
        construction.

        :param name: name of the setting to return
        :type name: str
        :return: the named setting
        :raises: AttributeError -- if the named setting is not found
        """
        if hasattr(settings, name):
            return getattr(settings, name)

        if name in self.defaults:
            return self.defaults[name]

        raise AttributeError("'{name}' setting not found".format(name=name))

views.py

# myapp/views.py

from myapp.conf import settings

print(settings.DEBUG)
print(settings.TEMP_DIR)