Udemy – Flask for Python Devs: Build Real-World Web Apps & REST APIs

Flask is a lightweight (“micro”) Python web framework for building web applications and APIs. “Micro” means its core is small and simple, HTTP handling, routing, templating, and a few utilities, while everything else (DB, auth, forms, migrations, etc.) is added via extensions.

Under the hood it relies on:

• Werkzeug – WSGI utilities (request/response, routing, server)
• Jinja2 – HTML templating engine

Because it’s minimal and modular, Flask is popular for prototypes, microservices, REST APIs, and production apps where you want flexibility over batteries-included.

What does Flask do?

Out of the box, Flask provides:

• Routing: Map URLs to Python functions (“views”).
• Request/Response objects: Access headers, query params, form data, files, JSON.
• Templating: Render HTML with Jinja2 (control flow, filters, auto-escaping).
• Sessions & Cookies: Signed, cookie-based session storage.
• Static files: Serve assets during development.
• Error handling & hooks: @app.errorhandler, before_request, after_request, teardown_request.
• CLI & Dev server: flask run, debug reloader, interactive debugger.

Through extensions you commonly add:

• Database/ORM: Flask-SQLAlchemy migrations with Flask-Migrate (Alembic).
• Forms & CSRF: Flask-WTF (WTForms + CSRF protection).
• Auth: Flask-Login (sessions), Flask-JWT-Extended (tokens).
• Caching/Queues: Flask-Caching, background tasks with Celery/RQ.
• Schema validation: Marshmallow/Pydantic (for APIs).

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