Flask

Flask's two foundational ideas - a thin WSGI application, and context-local proxies that make request-scoped globals like request and g feel like ordinary imports - and how those two ideas explain the rest of the framework.

Routes, requests, and responses.

Structuring larger Flask apps.

SQLAlchemy, Migrate, Login, and the ecosystem.

App/request context and globals.

Rendering and template inheritance.

JSON endpoints and `flask-smorest`.

The test client and fixtures.

Choosing the right framework.

Keeping small apps clean and testable.