class_docstr: A file like object that publishes the stream to a 0MQ PUB socket.
  
  Output is handed off to an IO Thread
class_docstr_tok: ["A","file","like","object","that","publishes","the","stream","to","a","0MQ","PUB","socket",".","Output","is","handed","off","to","an","IO","Thread"]
code: def closed(self):
      return self.pub_thread is None
  
imports: from __future__ import print_function
  import atexit
  from binascii import b2a_hex
  from collections import deque
  import os
  import sys
  import threading
  import warnings
  from io import StringIO, TextIOBase
  import zmq
  from zmq.eventloop.ioloop import IOLoop
  from zmq.eventloop.zmqstream import ZMQStream
  from jupyter_client.session import extract_header
  from ipython_genutils import py3compat
  from ipython_genutils.py3compat import unicode_type
label_desc: Use image node_id 5 for calling the OutStream obj's underlying member method code with example usage: obj.closed() and returns: unknown