def __init__(self, key):
        self._key = key
        self._authenticated = Deferred()
Execute the action.  `ar` is an :class:`ActionRequest
dataset/ETHPy150Open rapyuta/rce/rce-core/rce/core/network.py/_ConnectionValidator.__init__--crossover with--dataset/ETHPy150Open lsaffre/lino/lino/core/actions.py/Action.run_from_ui