def __init__(self, session, memstore, client_name, metadata,
                 require_trusted=True):
        self._session = session
        self._memstore = memstore
        try:
            self._client = session.query(Client) \
                .filter(Client.name == client_name).one()
        except exc.NoResultFound:
            raise KeyError(client_name % 'No Client with name %s found')
        self._metadata = metadata
        self._require_trusted = require_trusted
dataset/ETHPy150Open Yubico/u2fval/u2fval/core/controller.py/U2FController.__init__/swapped operands of `%`