new_contents: #! /usr/env python
  """ a recreation of spark-streaming's network_wordcount
  
  https://spark.apache.org/docs/2.2.0/streaming-programming-guide.html#a-quick-example
  
  Run this within an interactive session, or with
  > python -i -network_wordcount.py
  so that python won't exit before producing output.
  """
  
  from streamz import Stream
  
  # absolute port on localhost for now
  s = Stream.from_tcp(9999)
  s.map(bytes.split).flatten().frequencies().sink(print)
  
  print(
      """In another terminal executs
  > nc 127.0.0.1 9999
  and then start typing content
  """
  )
  
  s.start()
  
subject: Add wordcount example from spark