code: def get_setting(self, key, default=NOT_SET):
          
          if self._arca is None:
              raise LazySettingProperty.SettingsNotReady
          return self._arca.settings.get(*self.get_settings_keys(key), default=default)
docs: Gets a setting for the key.
  
          :raise KeyError: If the key is not set and default isn't provided.