code: def all(self, timeout=None, max_concurrency=64, auto_batch=True):
          
          return self.fanout('all', timeout=timeout,
                             max_concurrency=max_concurrency,
                             auto_batch=auto_batch)
docs: Fanout to all hosts.  Works otherwise exactly like :meth:`fanout`.
  
          Example::
  
              with cluster.all() as client:
                  client.flushdb()