def requestAvatar(self, avatarId, mind, interface):
        assert interface not in ivertex.IQ2QUser, (
            "default certificate store only supports one interface")
        return interface, DefaultQ2QAvatar(*avatarId.split("@")), lambda : None
dataset/ETHPy150Open twisted/vertex/vertex/q2q.py/DefaultCertificateStore.requestAvatar/operator `is` -> `not in`