def _get_env_vars(self) -> Dict[str, str]:
        """
        Return environmental variables in following format:
        {NAMESPACE_ENVNAME}

        :param owner_name:
        """

        self._validate()

        envs = {}
        for v in self._flat:
            name = v._get_env_name()
            envs[name] = str(v._get_value())

        envs = {k.upper(): v for k, v in envs.items()}

        return envs

        Return environmental variables in following format:
        {NAMESPACE_ENVNAME}

        :param owner_name:
        
src/envium/environ.py