Using child-process to call python inside node.js in heroku

I have a node.js application in which I have called a Python file using child process as

var spawn = require("child_process").spawn;

I have sent some arguments to python file and the python returns data using Print statement back to node.js

It works fine in local and when i deployed the application to Heroku. The pythons print statement is not getting displayed in node.js service.

Is there any thing has to be set in heroku to call the subprocess. Please help to fix this issue. Thanks in advance

via user3211705