Create new flask app

Here's a step-by-step guide to creating a new Flask app:

Step 1: Install Flask

If you haven't already, install Flask using pip:

pip install flask

Step 2: Create a new directory for your app

Create a new directory for your Flask app, e.g. my_flask_app:

mkdir my_flask_app

Step 3: Create a new file for your app

Create a new file called app.py in the my_flask_app directory:

touch my_flask_app/app.py

Step 4: Write your Flask app code

Open the app.py file and add the following code:

from flask import Flask

app = Flask(__name__)

@app.route("/")
def hello_world():
    return "Hello, World!"

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

This code creates a new Flask app, defines a single route ("/") that returns the string "Hello, World!", and runs the app in debug mode.

Step 5: Run your app

Run your app using the following command:

python app.py

This will start the Flask development server, and you can access your app by navigating to http://localhost:5000 in your web browser.

Step 6: Test your app

Open a web browser and navigate to http://localhost:5000. You should see the string "Hello, World!" displayed on the page.

That's it! You've created a new Flask app and run it successfully.

Additional steps: