How to use the keyring.util.properties function in keyring

    @properties.ClassProperty
    @classmethod
    def priority(cls):
        if not has_pyfs():
            raise RuntimeError("pyfs required")
        return 2

    @properties.NonDataProperty
    def file_path(self):
        """
        The path to the file where passwords are stored. This property
        may be overridden by the subclass or at the instance level.
        """
        return os.path.join(platform_.data_root(), self.filename)

    @properties.NonDataProperty
    def file_path(self):
        """
        The path to the file where passwords are stored. This property
        may be overridden by the subclass or at the instance level.
        """
        return os.path.join(platform_.data_root(), self.filename)

    @properties.NonDataProperty
    def keyring_key(self):
        # _unlock or _init_file will set the key or raise an exception
        if self._check_file():
            self._unlock()
        else:
            self._init_file()
        return self.keyring_key