How to execute python script in nodeJS Back-end

Question

I would like to execute a test.py from my nodeJS back-end, after watching several tutorial i writed this code :

function runTestPy(req, res) {
  const spawn = require('child_process').spawn;
  const process = spawn('python', ['./test.py']);
  process.stdout.on('data', (data) => {
    console.log(data.toString());
    console.log('out');
  });
  process.stdout.on('end', () => {
    console.log('fin');
  });
  console.log('merce');
}

module.exports.runTestPy = runTestPy;
runTestPy('', '');

and here my test.py :

print("hello world from python ")

The problem is that the function is working if I launch it independently from the command node test.py, but when I launch it from the project (after a npm run dev) its just do not work, it does not print "hello world from python" and the "out" log.

I think the problem come from

  const process = spawn('python', ['./test.py']);

but i just dont know how to install python in nodeJS and how to use it.

You don't "install python in node". Python is installed on the machine. You're just calling an OS executable, could be any script, not just python... Please show your file with the NPM commands — OneCricketeer
– OneCricketeer, Commented Jan 10, 2020 at 15:51
Although, why do you need node and python? It would be easier to just import and run Python modules from another python application — OneCricketeer
– OneCricketeer, Commented Jan 10, 2020 at 15:53
I think the issue is that you have written a relative path as './test.py'. — vibhor1997a
– vibhor1997a, Commented Jan 10, 2020 at 15:57

Rebai Ahmed · Accepted Answer · 2020-01-10 15:52:20Z

1

You can use Python-shell

npm install python-shell

Import the package :

import {PythonShell} from 'python-shell';

PythonShell.run('test.py', null, function (err) {
  if (err) throw err;
  console.log('finished');
});

answered Jan 10, 2020 at 15:52

Rebai Ahmed

1,6301 gold badge15 silver badges24 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Ankur Shah Over a year ago

How to pass multiple arguments in this library so we can read it in python script as an argument.

Collectives™ on Stack Overflow

How to execute python script in nodeJS Back-end

1 Answer 1

1 Comment

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Linked

Related