def getInterface(self, iTag):
        try:
            return self._interfaces[iTag]
        except KeyError:
            raise InvalidRequest('Can not get a non existent interface '
                                 "'{0}' from the container.".format(iTag))
Get and memoize connections to instances
dataset/ETHPy150Open rapyuta/rce/rce-core/rce/core/wrapper.py/Container.getInterface--crossover with--dataset/ETHPy150Open serverdensity/sd-agent/checks.d/pgbouncer.py/PgBouncer._get_connection