SOLVED I don't know how to use node_helper.js.

[emrhssla]

I tried to use python-shell. So I successfully finished the npm install python-shell.
But I saw it said that to use python-shell, you must use node_helper.js.
So I tried to execute a simple Python code. The notification I_DID in node_helper.js was well communicated and executed. However, the console in node_helper.js is not output, nor is python-shell working.
What is the problem?

var Testpythons;
Module.register("MMM-Testpython", {

    defaults: {},
    start: function (){
        Testpythons = this;
    },
  
  getDom: function() {
    var element = document.createElement("div")
    element.className = "myContent"
    element.id="divid"
    element.innerHTML = "Hello, World!!! " + this.config.foo
    var subElement = document.createElement("p")
    subElement.innerHTML = "Click" 
    subElement.id = "clickid"
    element.appendChild(subElement)
    return element
  },
  
  notificationReceived: function(notification, payload, sender) {
    switch(notification) {
      case "DOM_OBJECTS_CREATED":
      var elem = document.getElementById("clickid")
      elem.addEventListener("click", () => {
        Testpythons.sendSocketNotification("TESTPYTHON")
        console.log("hello~hello~hello~hello~hello~hello~hello~hello~hello~hello~")
        elem.innerHTML = "click success"
        
      }) 
        break
    }
  },
  socketNotificationReceived: function(notification, payload) {
    switch(notification) {
      case "I_DID":
        console.log("success")
        var elemk = document.getElementById("divid")
        elemk.innerHTML = "I_DID"
        break
    }
  },
})

node_helper.js

var NodeHelper = require("node_helper");
var PythonShell = require('python-shell');

module.exports = NodeHelper.create({
  start: function() {
    console.log("Starting module: " + this.name);
  },
  
  socketNotificationReceived: function(notification, payload) {
    switch(notification) {
      case "TESTPYTHON":
        console.log("notification : " + notification)
        this.sendSocketNotification("I_DID")
        PythonShell.runString('print("Hello Python")', null, function (err, result) {
            if (err) throw err;
            console.log(result);  
            });
        break
    }
  },
})  

[sdetweil]

see https://ourcodeworld.com/articles/read/286/how-to-execute-a-python-script-and-retrieve-output-data-and-errors-in-node-js

but your should have been ok… do you see the message
console.log("Starting module: " + this.name);

in the terminal window?

[emrhssla]

This post is deleted!

[emrhssla]

@sdetweil

var NodeHelper = require("node_helper");
var {PythonShell} = require('python-shell');

module.exports = NodeHelper.create({
  start: function() {
    console.log("Starting module: " + this.name);
  },
  
  socketNotificationReceived: function(notification, payload) {
    console.log("Starting module: " + this.name);
    switch(notification) {
      case "TESTPYTHON":
        console.log("notification : " + notification)
        this.sendSocketNotification("I_DID")
        PythonShell.runString('print("Hello Python")', null, function (err, result) {
            if (err) throw err;
            console.log(result);  
            });
        break
    }
  },
})  

console doesnt show Starting module…

[sdetweil]

@emrhssla ok, there are two different output areas…

the developers window, which u posted is from the module.js side…
the node helper content comes out in the terminal window.

start you mirror app,
then start it with

npm start &

(note the & at the end)
now you should be able to see any messages in the terminal window from the node_helper

[emrhssla]

@sdetweil oh!!!
thank you very very very much