question How to use ExecuteScript (with python as a script engine) for an exercise to add numbers? [Novice user trying to learn NiFi] in Support Questions

question How to use ExecuteScript (with python as a script engine) for an exercise to add numbers? [Novice user trying to learn NiFi] in Support Questions https://community.cloudera.com/t5/Support-Questions/How-to-use-ExecuteScript-with-python-as-a-script-engine-for/m-p/194694#M156754 I am relatively new to NiFi and am not sure how to do the following correctly. I would like to use <CODE>ExecuteScript</CODE> processor (script engine: python) to do the following (only in python please):1) There is a CSV file containing the following information (the first row is the header):first,second,third<PRE><CODE>1,4,9 7,5,2 3,8,7 </CODE></PRE>2) I would like to find the sum of individual rows and generate a final file with a modified header. The final file should look like this:first,second,third,total<PRE><CODE>1,4,9,14 7,5,2,14 3,8,7,18 </CODE></PRE>For the python script, I wrote:<PRE><CODE>def summation(first,second,third): numbers = first + second + third return numbers flowFile = session.get() if (flowFile != None): flowFile = session.write(flowFile, summation()) </CODE></PRE>But it does not work and I am not sure how to fix this. Can anyone provide me an understanding on how to approach this problem?The NiFi flow:<img src="https://community.cloudera.com/t5/image/serverpage/image-id/18068i820FF9D84E621EC3/image-size/medium?v=v2&px=400" role="button" title="79545-nififlow.png" alt="79545-nififlow.png" /> Sun, 18 Aug 2019 06:44:43 GMT annaayub99 2019-08-18T06:44:43Z