Call Python Script Using Node.js Child_process

I was trying to call a python code from my node file. Here is my node.js Code: var util = require('util'); var spawn = require('child_process').spawn; var process = spawn('python

Solution 1:

There is no problem ...

Here is a slight tweak of your working code (I convert the buffer to string so its human readable)

// spawn_python.jsvar util = require("util");

var spawn = require("child_process").spawn;
var process = spawn('python',["python_launched_from_nodejs.py"]);

util.log('readingin')

process.stdout.on('data',function(chunk){

    var textChunk = chunk.toString('utf8');// buffer to string

    util.log(textChunk);
});

and here is your python

# python_launched_from_nodejs.py
import sys

data = "this began life in python"
print(data)
sys.stdout.flush()

finally here is output of a run

node spawn_python.js 
11 Dec 00:06:17 - readingin
11 Dec 00:06:17 - this began life in python

node --version

v5.2.0

Solution 2:

I was also facing the same issue, I found this:

var myPythonScript = "script.py";
// Provide the path of the python executable, if python is available as // environment variable then you can use only "python"var pythonExecutable = "python.exe";

// Function to convert an Uint8Array to a stringvar uint8arrayToString = function(data){
    returnString.fromCharCode.apply(null, data);
};

const spawn = require('child_process').spawn;
const scriptExecution = spawn(pythonExecutable, [myPythonScript]);

// Handle normal output
scriptExecution.stdout.on('data', (data) => {
   console.log(uint8arrayToString(data));
});

// Handle error output
scriptExecution.stderr.on('data', (data) => {
    // As said before, convert the Uint8Array to a readable string.console.log(uint8arrayToString(data));
});

scriptExecution.on('exit', (code) => {
    console.log("Process quit with code : " + code);
});

Solution 3:

Your python code is not correct:

import sys

data = "test"
print(data)   ###not test
sys.stdout.flush()

Solution 4:

You could always try something like this:

var child_process = require('child_process');

  child_process.exec('python myPythonScript.py', function (err){
    if (err) {
    console.log("child processes failed with error code: " + err.code);
  }
});