Question 290499 in Javascript Question posted in
A very good W3school tutorial can be found here.

How can I call my Python function in my javaScript file?

I want to use my Python function in JavaScript. Obviously, my code is more complicated than demonstrated below, but this is the smallest base on which I was able to replicate the problem:

main.mjs

dbutils.notebook.run("./aPythonFile.py", 5, {"parameter1": "helloWorld"})

aPythonFile.py:

def my_python_function(parameter1):
    print(parameter1)

Error message:

ReferenceError: dbutils is not defined
at file:///c:/Users/q612386/Dev/SkillUp/SUPAC23-53/Python%20+%20JavaScript%20(ohne%20Listener%20oder%20API)/scripts/tempCodeRunnerFile.js:1:1
at ModuleJob.run (node:internal/modules/esm/module_job:194:25)

Changing .mjs to .js did not fix the problem.

I am sure it is just a weird import error but I can’t seem to find it. Any other simple solution to call a python function in JavaScript is very welcome, too (except for Flask or django).

Thank you!

Tags:

3

Answers


  1. 0

    script.py

    import sys

# Receive arguments from Node.js
arg_from_node = sys.argv[1]
print("Argument received from Node.js:", arg_from_node)

# Your Python code here...

    node_script.js

    const { spawn } = require('child_process');

// Path to your Python script
const pythonScript = 'path/to/script.py';

// Dynamic value from Node.js
const dynamicValue = 'Hello from Node.js';

// Spawn a child process
const pythonProcess = spawn('python', [pythonScript, dynamicValue]);

// Listen for data from the Python script
pythonProcess.stdout.on('data', (data) => {
  console.log(`Python Output: ${data}`);
});

// Listen for any errors from the Python script
pythonProcess.stderr.on('data', (data) => {
  console.error(`Error from Python: ${data}`);
});

// Listen for the process to exit
pythonProcess.on('close', (code) => {
  console.log(`Python process exited with code ${code}`);
});
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  2. 0

    Child Process Module:
    Use the child_process module which Node.js provides to spawn child processes and run Python code.

    Code:

    const { spawn } = require('child_process');

const pythonProcess = spawn('python', ['./aPythonFile.py', 'helloWorld']);

pythonProcess.stdout.on('data', (data) => {
  console.log(`stdout: ${data}`);
});

pythonProcess.stderr.on('data', (data) => {
  console.error(`stderr: ${data}`);
});

pythonProcess.on('close', (code) => {
  console.log(`child process exited with code ${code}`);
});

    In Python Script parse the arguments:

    import sys

def my_python_function(parameter1):
    print(parameter1)

if __name__ == "__main__":
    my_python_function(sys.argv[1])
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  3. 0

    Node.js allows you to spawn child processes to run external commands. You can use this to execute Python scripts. To run Python code from JavaScript outside of a framework like Flask or Django, you can consider this method:

    You can do it this way:

    const { spawn } = require('child_process');

const pythonProcess = spawn('python', ['./aPythonFile.py', 'helloWorld']);

pythonProcess.stdout.on('data', (data) => {
  console.log(`stdout: ${data}`);
});

pythonProcess.stderr.on('data', (data) => {
  console.error(`stderr: ${data}`);
});

pythonProcess.on('close', (code) => {
  console.log(`child process exited with code ${code}`);
});

    If you prefer not to use Flask or Django, you can still create a simple HTTP server in Python that listens for requests and executes your Python function. You can then call this server from your JavaScript code using HTTP requests.

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