Flask

What is Flask?

Flask is a lightweight Python web framework (microframework) that gives you the freedom to choose which components you need. Flask is easy to learn yet powerful enough for production applications. It is used by Netflix, LinkedIn, Pinterest and countless startups.

Why Flask is useful

Flask gives you maximum control with minimal complexity:

• Microframework: Start small and only add what you need
• Python ecosystem: Use all Python libraries for data science, AI and more
• Extensible: Hundreds of extensions for databases, authentication, forms
• Easy to learn: "Hello World" in 5 lines of code

Time savings with Flask

Flask enables rapid prototyping. Build a working API or web application in record time and expand when needed.

Hidden features that often go unused

Flask is often used simply, but it can handle much more complex applications:

• Application Factory: Create multiple configurations for testing, staging and production.
• Signals: Event system for loose coupling between components.
• CLI Commands: Register custom management commands via Click.
• g Object: Request-scoped storage for database connections and authentication data.
• Before/After Request: Hooks for preprocessing and postprocessing of all requests.
• Flask-SocketIO: WebSocket support for real-time bidirectional communication.

Integrations with other tools

Flask integrates with many other tools and services:

• SQLAlchemy: The standard ORM for Python — works seamlessly with Flask.
• Celery & Redis: Background tasks and caching for scalable applications.
• Docker & Kubernetes: Flask apps are ideal for containerisation.