docstr: Schedule a function to be called later
  
  Override for different IOLoop implementations
  
  Tornado and asyncio happen to both have ioloop.call_later
  with the same signature.
docstr_tok: ["Schedule","a","function","to","be","called","later","Override","for","different","IOLoop","implementations","Tornado","and","asyncio","happen","to","both","have","ioloop.call_later","with","the","same","signature","."]
code: def _call_later(self, delay, callback):
      """Schedule a function to be called later
  
      Override for different IOLoop implementations
  
      Tornado and asyncio happen to both have ioloop.call_later
      with the same signature.
      """
      self.io_loop.call_later(delay, callback)
  
imports: from collections import namedtuple, deque
  from itertools import chain
  from zmq import EVENTS, POLLOUT, POLLIN
  import zmq
label_desc: Use image node_id 12 for calling the _AsyncSocket obj's underlying member method code with example usage: obj._call_later(delay, callback) without return types