title: How to pass a parameter to python script in Nifi
body: <p>Maybe this is a stupid question, but I have to ask.</p>
  
  <p>I have a Collect_data processor in Nifi and it streams messages into another process that use a python script to parse that and create json file. The problem is that I don't know what is the input for function in python script. How to pass those messages (16-digit numbers) from Collect_data processor into next processor contains python script. Is there any good, basic example about this?</p>
  
  <p>I was already looking for some examples online, but not really get it.</p>
  
  <pre><code>import datetime
  import hashlib
  from urlparse import urlparse, parse_qs
  import sys
  from urlparse import urlparse, parse_qs
  from datetime import *
  import json
  import java.io
  from org.apache.commons.io import IOUtils
  from java.nio.charset import StandardCharsets
  from org.apache.nifi.processor.io import StreamCallback
  from time import time
  
  
  def parse_zap(inputStream, outputStream):
      data = inputStream
      buf = (hashlib.sha256(bytearray.fromhex(data)).hexdigest())
      buf = int(buf, 16)
      buf_check = str(buf)
      if buf_check[17] == 2:
          pass
      datetime_now = datetime.now()
      log_date = datetime_now.isoformat()
      try:
          mac = buf_check[7:14].upper()
          ams_id = buf_check[8:]
          action = buf_check[3:4]
          time_a = int(time())
          dict_test = {
          "user": {
              "guruq" : 'false'
          },
          "device" : {
              "type" : "siolbox",
              "mac": mac
          },
          "event" : {
              "origin" : "iptv",
              "timestamp": time_a,
              "type": "zap",
              "product-type" : "tv-channel",
              "channel": {
                  "id" : 'channel_id',
                  "ams-id": ams_id
              },
              "content": {
                  "action": action
              }
          }
          }
          return dict_test
      except Exception as e:
          print('%s nod PARSE 500 \"%s\"' % (log_date, e))
  </code></pre>
  
  <p>I thank I'm reading correctly, but now I can't create output. 
  Thanks in advance.</p>