Practice routing, blueprints, SQLAlchemy, and Flask extensions with microframework scenarios
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Routing and URL building
Request handling and context
Blueprints and application factory
SQLAlchemy ORM integration
Flask-Login and authentication
RESTful API development
A: Application context: holds app-level data (config, database connections), lasts lifetime of app. Request context: holds request-specific data (request, session), created per request, destroyed after response. Contexts are thread-local. Access via 'current_app' and 'request' proxies. Blueprint functions run in both contexts.
A: Blueprints organize Flask apps into modules. Define routes, templates, static files separately, register with app later. Use for: large apps, reusable components, separating admin/API/frontend. Blueprints support URL prefixes, subdomains, before_request hooks. Enable modular architecture.
A: Use Flask-SQLAlchemy extension for SQLAlchemy integration. Define models as db.Model classes. Sessions are scoped to requests (automatic cleanup). Use app context for database operations outside requests. Connection pooling handled automatically. For raw SQL: use db.session.execute().
A: Routes map URLs to view functions using @app.route(). Variable rules: <int:id>, <string:name>, <path:path> capture URL parts. Defaults and multiple routes possible. url_for() generates URLs from function names (reverse routing). Supports HTTP methods restriction. Can use converters for custom types.
Understand the Application Factory pattern for creating Flask apps
Master Flask extensions: Flask-SQLAlchemy, Flask-Login, Flask-WTF, Flask-Migrate
Know how to structure larger Flask applications with blueprints
Practice error handling and custom error pages
Understand Flask's config system and environment-specific configurations
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