old_contents: #!/usr/bin/env python2
  
  import array
  import binascii
  import zmq
  import struct
  
  port = 28332
  
  zmqContext = zmq.Context()
  zmqSubSocket = zmqContext.socket(zmq.SUB)
  zmqSubSocket.setsockopt(zmq.SUBSCRIBE, "hashblock")
  zmqSubSocket.setsockopt(zmq.SUBSCRIBE, "hashtx")
  zmqSubSocket.setsockopt(zmq.SUBSCRIBE, "rawblock")
  zmqSubSocket.setsockopt(zmq.SUBSCRIBE, "rawtx")
  zmqSubSocket.connect("tcp://127.0.0.1:%i" % port)
  
  try:
      while True:
          msg = zmqSubSocket.recv_multipart()
          topic = str(msg[0])
          body = msg[1]
          sequence = "Unknown";
          if len(msg[-1]) == 4:
            msgSequence = struct.unpack('<I', msg[-1])[-1]
            sequence = str(msgSequence)
          if topic == "hashblock":
              print '- HASH BLOCK ('+sequence+') -'
              print binascii.hexlify(body)
          elif topic == "hashtx":
              print '- HASH TX  ('+sequence+') -'
              print binascii.hexlify(body)
          elif topic == "rawblock":
              print '- RAW BLOCK HEADER ('+sequence+') -'
              print binascii.hexlify(body[:80])
          elif topic == "rawtx":
              print '- RAW TX ('+sequence+') -'
              print binascii.hexlify(body)
  
  except KeyboardInterrupt:
      zmqContext.destroy()
  
new_contents: #!/usr/bin/env python2
  # Copyright (c) 2014-2016 The Bitcoin Core developers
  # Distributed under the MIT software license, see the accompanying
  # file COPYING or http://www.opensource.org/licenses/mit-license.php.
  
  import array
  import binascii
  import zmq
  import struct
  
  port = 28332
  
  zmqContext = zmq.Context()
  zmqSubSocket = zmqContext.socket(zmq.SUB)
  zmqSubSocket.setsockopt(zmq.SUBSCRIBE, "hashblock")
  zmqSubSocket.setsockopt(zmq.SUBSCRIBE, "hashtx")
  zmqSubSocket.setsockopt(zmq.SUBSCRIBE, "rawblock")
  zmqSubSocket.setsockopt(zmq.SUBSCRIBE, "rawtx")
  zmqSubSocket.connect("tcp://127.0.0.1:%i" % port)
  
  try:
      while True:
          msg = zmqSubSocket.recv_multipart()
          topic = str(msg[0])
          body = msg[1]
          sequence = "Unknown";
          if len(msg[-1]) == 4:
            msgSequence = struct.unpack('<I', msg[-1])[-1]
            sequence = str(msgSequence)
          if topic == "hashblock":
              print '- HASH BLOCK ('+sequence+') -'
              print binascii.hexlify(body)
          elif topic == "hashtx":
              print '- HASH TX  ('+sequence+') -'
              print binascii.hexlify(body)
          elif topic == "rawblock":
              print '- RAW BLOCK HEADER ('+sequence+') -'
              print binascii.hexlify(body[:80])
          elif topic == "rawtx":
              print '- RAW TX ('+sequence+') -'
              print binascii.hexlify(body)
  
  except KeyboardInterrupt:
      zmqContext.destroy()
  
subject: add MIT License copyright header to zmq_sub.py