How do you set up and test an HTML file locally with Python and Flask?

Here are the steps to set up and test an HTML file locally with Python and Flask:

1. Install Flask: First, you need to install Flask on your system. You can do this by running the following command in your terminal: 

2. Create an HTML file: Next, create an HTML file that you want to test. For example, create a file named 'index. html' in your project directory with the following content:

3. Create a Flask app: Create a new file named in your project directory and add the following code to create a Flask app:

This code creates a new Flask app and defines a route for the root URL  (" / ") When the root URL is accessed, the "index()" function is called, which renders the 'index.html' template using the 'render_template()' function.

4. Run the Flask app: In your terminal, navigate to your project directory and run the following command to start the Flask app:

This will start the Flask development server and the app will be available at

'http://localhost:5000/'

5. Test the HTML file: Open your web browser and navigate to "http://localhost:5000/". You should see the "Hello Flask!" message displayed in the browser.

That's it! You have now set up and tested an HTML file locally with Python and Flask. You can modify the HTML file and Flask app to suit your needs and test any changes by reloading the web page in your browser.