Using Flask with thonny for my project website need help

[Larz60+]

You're vague as to what platform you are running on. I will assume Rpi5 for an example --
The following answer is from GROK on X:

Output:
To run a Flask application using the Thonny IDE on a Raspberry Pi 5 with Python, follow these steps. Since Thonny comes pre-installed with Raspberry Pi OS, it’s a convenient choice for beginners and seasoned developers alike. Below is a step-by-step guide:
Step 1: Set Up Your Raspberry Pi

    Ensure Raspberry Pi OS is Installed: Make sure your Raspberry Pi 5 is running the latest version of Raspberry Pi OS (Bookworm recommended as of March 2025). You can update it via the terminal:
    bash

    sudo apt update
    sudo apt upgrade

    Check Python Version: Thonny uses Python 3 by default. Verify it’s installed:
    bash

    python3 --version

    As of March 2025, Python 3.11 or later should be pre-installed with Raspberry Pi OS.

Step 2: Install Flask

    Open a Terminal: You can do this directly on the Raspberry Pi or via SSH.
    Install Flask: Use pip to install Flask:
    bash

    pip3 install flask

    Verify Installation: Check that Flask is installed:
    bash

    pip3 show flask

Step 3: Create a Simple Flask Application

    Open Thonny: On the Raspberry Pi desktop, go to Menu > Programming > Thonny Python IDE.
    Create a New File: In Thonny, click File > New.
    Write a Basic Flask App: Enter the following code:
    python

    from flask import Flask

    app = Flask(__name__)

    @app.route('/')
    def hello():
        return "Hello, Raspberry Pi 5!"

    if __name__ == '__main__':
        app.run(host='0.0.0.0', port=5000, debug=True)

        host='0.0.0.0': Makes the app accessible over your local network.
        port=5000: Default Flask port.
        debug=True: Enables debug mode (useful for development, but disable for production).
    Save the File: Click File > Save As, name it app.py, and save it in a convenient location (e.g., /home/pi/).

Step 4: Run the Flask Application in Thonny

    Run the Code: In Thonny, click the green Run button (▶) or press F5.
    Check Output: Thonny’s shell will display something like:

    * Running on http://0.0.0.0:5000
    * Debug mode: on

    If there are errors, Thonny will highlight them in the code and shell.
    Test the App: Open a web browser on the Raspberry Pi or another device on the same network. Enter the Pi’s IP address followed by :5000 (e.g., http://192.168.1.100:5000). To find your Pi’s IP:
    bash

    hostname -I

    You should see "Hello, Raspberry Pi 5!" displayed.

Step 5: Troubleshooting

    Port Conflict: If port 5000 is in use, change the port value in app.run() (e.g., port=5001).
    Firewall: Ensure the Raspberry Pi’s firewall allows traffic on port 5000:
    bash

    sudo ufw allow 5000

    Network Access: If the app isn’t accessible from other devices, verify host='0.0.0.0' is set and check your network settings.

Step 6: Enhance Your Flask App (Optional)

    Add more routes, e.g.:
    python

    @app.route('/about')
    def about():
        return "This is a Flask app on Raspberry Pi 5!"

    Use Thonny’s debugger (Debug button or F6) to step through code if needed.

Notes

    Thonny Limitations: Thonny is great for simple projects but may feel basic for complex Flask apps. For larger projects, consider using a terminal or another IDE like VS Code (via SSH).
    Performance: The Raspberry Pi 5 is powerful, but Flask’s built-in server is for development. For production, use a WSGI server like Gunicorn:
    bash

    pip3 install gunicorn
    gunicorn --bind 0.0.0.0:5000 app:app

That’s it! You now have a Flask application running on your Raspberry Pi 5 using Thonny. Let me know if you need help expanding it further!