How to run a python script in the background on click of html button using flask framework

Question

''' upload.html'''

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<h2 style="color:DodgerBlue;">File Uploader</h2>

<form id = "upload-form" action = "{{ url_for('upload') }}" method="POST" 
 enctype="multipart/form-data">
<input type = "file" name = "file" accept = "files/*" multiple>
<input type = "submit" value = "submit">
</form>
</body>
</html>

''' app.py'''

import os
from flask import Flask, request, render_template, send_from_directory
app = Flask(__name__)

APP_ROOT = os.path.dirname(os.path.abspath(__file__))

@app.route("/")
def index():
    return render_template("upload.html")

@app.route("/upload", methods=["POST"])
def upload():

    target = os.path.join(APP_ROOT, 'Athena_XML_files/')
    print(target)
    if not os.path.isdir(target):
        os.mkdir(target)

    for file in request.files.getlist("file"):
        print(file)
        filename = file.filename
        destination = "/".join([target, filename])
        print(destination)
        file.save(destination)

    return render_template("complete.html")

@app.route('/run_script')
def run_script():
    app.config.from_pyfile("main.py")
    return render_template('result.html')

if __name__ == "__main__":
    app.run(port=4555, debug=True)

'''complete.html'''

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<h1>XML files Uploaded</h1>
<ul><br><br>
<h2><strong>Please click to obtain the result</strong></h2><br><br>
<ul class="nav nav-stacked">
    <li role="presentation"><a href="{{ url_for('run_script') }}">CLICK  
HERE</a></li>
</ul>
</ul>
</body>
</html>

As the XML files are uploaded and the CLICK HERE button is clicked, main.py file should run in the background for which i have made a function in app.py file to run the main.py file.

Uploading works well, but on click of button the main.py file is not running in the background.

You need to import main.py in your imports and then call the function inside main.py. — RyanH
– RyanH, Commented Mar 23, 2019 at 22:32

Artist Unknown · Accepted Answer · 2019-03-24 02:23:04Z

I'm not sure if your idea is a good one. I posted some small solutions, but you should read this article for a better practice.

1) If you want to run an external script from inside flask, you could use subprocess to run a script from the command line.

@app.route('/run-script')
def run_script():
   result = subprocess.check_output("python main.py", shell=True)
   return render_template('results.html', **locals())

2) If you want to run Python code in background without any return, you could create a thread.

from threading import Thread

@app.route('/run-in-background')
def run_in_background():
    run_func()
    return redirect(url_for('.index'))

def run_func():
    data = { 'some': 'data', 'any': 'data' }
    thr = Thread(target=run_async_func, args=[app, data])
    thr.start()
    return thr

def run_async_func(app, data):
    with app.app_context():
    # Your working code here!
    example_module.do_somthing_with(data)

Not sure if it helps. Both solutions could make a lot mess.

You should read the flask docs. The app.config.from_pyfile function evaluates configuration data from Python code. This is very different than your question.

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