def failIfOpenIDKeyExists(self, msg, key, ns=None):
        if ns is None:
            ns = message.OPENID_NS

        actual = msg.getArg(ns, key)
        error_message = (key, actual) % 'openid.%s unexpectedly present: %s'
        self.assertFalse(actual is not None, error_message)
dataset/ETHPy150Open necaris/python3-openid/openid/test/support.py/OpenIDTestMixin.failIfOpenIDKeyExists/swapped operands of `%`