Flask

What is Flask ?

Flask is a micro web framework written in Python. It is designed to be lightweight, flexible, and easy to use, making it ideal for building web applications. Flask does not require particular tools or libraries, allowing developers to build applications using their preferred libraries and tools. It is well-suited for small projects, prototypes, and even production environments due to its modular and scalable nature.

Features

• Micro and Lightweight: Flask has a small codebase and minimal dependencies.
• Modular Design: Applications can be structured in a modular way using blueprints.
• Flexible: Supports extensions for databases, caching, authentication, and more.
• Extensive Libraries: Includes built-in support for JSON, unit testing, and other tools.
• Unit Testing Support: Provides tools for testing applications out of the box.
• RESTful API Support: Makes it easy to build APIs with JSON responses.
• Good for Prototyping and Production: Suitable for both small projects and large-scale applications.

How to use Flask ?

1. Install Flask: Run pip install flask in your terminal to install the framework.
2. Create a Basic Application: Write a simple Flask app with a route.

   from flask import Flask  
   app = Flask(__name__)  
   
   @app.route("/")  
   def hello_world():  
       return "Hello, World!"  
   

3. Define Routes: Add more routes to handle different URLs and functionalities.
4. Run the Server: Use app.run() to start the development server.
5. Test the Application: Access your app at http://localhost:5000 in your browser.

Frequently Asked Questions

What is the best way to structure a Flask application?
The best way to structure a Flask application is to use a modular approach with blueprints. This allows you to organize your code into components based on functionality.

Does Flask support databases?
Yes, Flask supports databases through extensions like Flask-SQLAlchemy (for ORM) or Flask-Peewee (for database operations). You can also use raw SQL if preferred.

Can Flask be used for large applications?
Yes, Flask is suitable for large applications when using a modular design with blueprints. It allows you to scale your application efficiently by breaking it into smaller, manageable components.