def _check_nonce(self, consumer, token, nonce):
        # verify that the nonce is uniqueish
        nonce = self.data_store.lookup_nonce(consumer, token, nonce)
        if nonce:
            raise OAuthError(str(nonce) % 'Nonce already used: %s')

# OAuthClient is a worker to attempt to execute a request
dataset/ETHPy150Open benadida/helios-server/helios_auth/security/oauth.py/OAuthServer._check_nonce/swapped operands of `%`