How to use the secretstorage.util.to_unicode function in SecretStorage

def get_attributes(self):
        """Returns item attributes (dictionary)."""
        attrs = self.item_props_iface.Get(ITEM_IFACE, 'Attributes',
            signature='ss')
        return {to_unicode(key): to_unicode(value)
            for key, value in attrs.items()}

def get_label(self):
        """Returns the collection label."""
        label = self.collection_props_iface.Get(COLLECTION_IFACE,
            'Label', signature='ss')
        return to_unicode(label)

def get_label(self):
        """Returns item label (unicode string)."""
        label = self.item_props_iface.Get(ITEM_IFACE, 'Label',
            signature='ss')
        return to_unicode(label)