Creating a Basic Flask App in 5 Minutes: A Beginner’s Guide to Python Flask

Flask is a lightweight WSGI web application framework for Python that allows you to quickly build web applications. In this tutorial, I will show you how to create a simple Flask app in just 5 minutes.

Step 1: Install Flask
Before we get started, you need to make sure you have Flask installed. You can install Flask using pip, which is the Python package installer. Open your terminal and run the following command:

pip install Flask

Step 2: Create a new Python file
Next, create a new Python file for your Flask app. You can name this file whatever you like, but for this tutorial, let’s name it app.py.

Step 3: Write the code
Open your app.py file and add the following code:

from flask import Flask

app = Flask(__name__)

@app.route('/')
def index():
    return 'Hello, World!'

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

In this code, we import the Flask class from the flask module and create a new Flask app instance. We then define a route for the root URL ('/') that returns the string 'Hello, World!'. Finally, we run the app in debug mode.

Step 4: Run the app
To run your Flask app, go back to your terminal and navigate to the directory where your app.py file is located. Then run the following command:

python app.py

You should see output indicating that your Flask app is running. Open your web browser and navigate to http://127.0.0.1:5000/ to see your app in action. You should see the message 'Hello, World!' displayed on the page.

And that’s it! You have successfully created a simple Flask app in just 5 minutes. Feel free to experiment with the code and add more routes or functionality to your app. Flask is a versatile framework that can be used to build a wide variety of web applications, so the possibilities are endless. Happy coding!