docs: def poll_until(self, state, interval=2):
          """
          ::
          
              GET /:login/machines/:id
          
          :param state: target state
          :type state: :py:class:`basestring`
          
          :param interval: pause in seconds between polls
          :type interval: :py:class:`int`
          
          Convenience method that continuously polls the current state of the 
          machine remotely, and returns until the named `state` argument is 
          reached. The default wait `interval` between requests is 2 seconds, 
          but it may be changed.
          
          .. Note:: If the next state is wrongly identified, this method may
              loop forever.
          """
          while self.status() != state:
              time.sleep(interval)