PythonFlask

python3 and pip should be preinstalled

python3 -m venv venv

. venv/bin/activate

pip install Flask

Now run the application using,

flask --app hello run

You can see the port details in the terminal,

• Serving Flask app 'hello'
• Running on http://127.0.0.1:5000 (Press CTRL+C to quit)

Reference: https://flask.palletsprojects.com/en/2.2.x/installation/