Flask

Build web apps and APIs with a small, honest framework. Real Flask runs right here. 16 modules of 10 minutes each, with questions that check your answers in the browser.

Start the track

Foundations

• 1. What a web framework does; request/responseFree
  Understand what really happens when a browser loads a page, the parts of an HTTP request and response, and which jobs a framework like Flask takes off your hands.
• 2. Your first Flask app and routesFree
  Create a Flask app, connect URLs to Python functions with @app.route, and send requests to it.
• 3. Dynamic routes and URL parametersFree
  Capture parts of the URL as function arguments, convert them to the right type, return 404 for unknown items, and build URLs with url_for.
• 4. HTTP methods: GET and POSTFree
  Handle reading and sending data on the same URL, read posted form data, follow the Post/Redirect/Get pattern, and return the right status codes.

Intermediate

• 5. Templates with Jinja2Free
  Move HTML out of Python into templates, fill them with data, loop and branch inside them, share a base layout, and let auto-escaping keep you safe.
• 6. Serving static filesFree
  Serve CSS, images, JavaScript and downloadable files from the static folder, link them with url_for, and send files generated on the fly.
• 7. Handling form data and query stringsFree
  Read search filters from the query string and submitted forms from the body, convert and validate them, and redisplay a form with errors.
• 8. Returning JSON and building a simple APIFree
  Build a small REST API that lists, reads, creates, updates and deletes resources with JSON, consistent URLs and correct status codes.

Advanced

• 9. Blueprints and app structurePro
  Split a growing Flask app into blueprints, each with its own routes and URL prefix, and register them on one app.
• 10. Working with a database (SQLAlchemy intro)Pro
  Store data in a real database with Flask-SQLAlchemy models, query and change it from routes, and keep it safe with sessions and commits.
• 11. Error handling and status codesPro
  Choose the right status code for every outcome, register error handlers for friendly pages and JSON, raise your own HTTP errors, and log unexpected failures.
• 12. Sessions and cookiesPro
  Remember things about a visitor between requests with cookies and Flask's signed session, build a shopping cart, and keep it secure.

Expert

• 13. Application factory pattern and configPro
  Create the app inside a function, load configuration per environment from classes and environment variables, and make apps easy to test.
• 14. Authentication basicsPro
  Store passwords safely with hashing, log users in and out with the session, protect routes with a login_required decorator, and check permissions.
• 15. Testing a Flask appPro
  Test routes with the test client and pytest fixtures, use a fresh app and database per test, cover errors and permissions, and test logic without HTTP.
• 16. Clean project structure for a real appPro
  Put everything together, factory, blueprints, services, models, config, tests, into a layout that stays understandable as the app grows.

Track project

• Flask Project: Toko Kita's shop backendPro
  Three graded tasks that build the back end of a real shop. An orders API that validates everything and keeps stock right, a product search endpoint with filters and sorting, and a shop page rendered from a shared layout.

Pro modules unlock with one payment of Rp 149.000, yours to keep.