def unregister_safe(self, parent, key):
        try:
            return self.unregister(parent, key)
        except Exception as ex:
            log.exception((parent, key) % "Error unregistering key=%s/%s")
dataset/ETHPy150Open ooici/pyon/pyon/ion/directory.py/Directory.unregister_safe/swapped operands of `%`