title: how to use one thread to listening all subscribe channel for redis？
body: <p>I use python 3.6.3, the channel build dynamically. 
  the redis_client build when the client connect to webwsocket server.</p>
  
  <p>I have about 1000 to 100,0000 redis_clients, every redis_client subscribe some channels.</p>
  
  <p>How to use one thread or IOLoop listenning all clients message?
  Can you give me an example which the thread can add new pubsub object to listening more channels?</p>
  
  <p>Is there any solution use coroutine replace thread waiting here and can join all coroutine together (can not use joinall as some listener will approach later on.)
  I using redis-py library.</p>