Introduction to Flask

Flask is a popular web framework for Python that is designed to make it easy to build web applications. It is lightweight, simple, and easy to learn, which makes it a great choice for beginners and experienced developers alike.

Getting Started with Flask

To get started with Flask, you will need to have Python installed on your computer. Once you have Python installed, you can use the pip package manager to install Flask by running the following command:

pip install Flask

Creating a Simple Flask App

After installing Flask, you can create a simple web application by writing a few lines of code. Here’s an example of a basic Flask app that displays a “Hello, World!” message:

from flask import Flask
app = Flask(__name__)

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

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

Running the Flask App

To run the Flask app, save the code in a file named app.py and then run the following command in your terminal:

python app.py

After running the command, you should see a message indicating that the Flask app is running. You can then open a web browser and go to http://localhost:5000 to see the “Hello, World!” message displayed.

Additional Features of Flask

Flask provides many features for building web applications, including support for routing, templates, and form handling. It also has a built-in development server for testing your app locally before deploying it to a production environment.

Conclusion

Flask is a powerful and easy-to-use web framework for building web applications with Python. Whether you are a beginner or an experienced developer, Flask provides a great platform for creating and deploying web apps. With its simplicity and flexibility, Flask is a great choice for anyone looking to get started with web development.