code: def config(self):
          
          if self._full_config is None:
              self._full_config = DotDict()
              self._full_config.merge(self._default)
              self._full_config.merge(self._config)
              self._full_config.merge(self._environment)
              self._full_config.merge(self._override)
          return self._full_config
docs: Get the complete configuration where the default, config,
          environment, and override values are merged together.
  
          Returns:
              (DotDict): A dictionary of configuration values that
                  allows lookups using dot notation.