def __init__(self, namespace, container):
        super(Container, self).__init__(namespace)

        self._container = container
        container.notifyOnDeath(self._containerDied)

        self._nodes = {}
        self._parameters = {}
        self._interfaces = {}
failsafe_add doesn't fail if the item is already in the session
dataset/ETHPy150Open rapyuta/rce/rce-core/rce/core/wrapper.py/Container.__init__--crossover with--dataset/ETHPy150Open hasgeek/coaster/tests/test_models.py/TestCoasterModels.test_failsafe_add_existing