Flask Sequence — IB Computer Science🔖

Where this is going🔖

By the end of this sequence, you will build a web application from scratch — a Flask app that creates, reads, updates, and deletes data in a database. A CRUD app.

This is not the IA. This is the minimum build path to get you to the point where the IA is even possible. If you cannot build a basic CRUD app, you cannot build an IA. These skills are table stakes — the things you need to have before you start thinking about your own project, your own client, your own data model.

Week 6 is where you prove it: you'll design and build a complete CRUD application on your own. Think of it as a dress rehearsal for the complexity of the IA, not a mini version of the assessment itself.

Weeks 1-3: Record of Tasks (main quest)
  1. flask-hello         Routes and strings
  2. flask-templates     Jinja2 and base.html
  3. flask-tasks-file    Forms and file I/O
 
Weeks 4-5: Birthdays (side quest)
  4. flask-birthdays-sql    Raw SQL with CS50 library
  5. flask-birthdays-orm    SQLAlchemy + Flask-WTF (group merge)
 
Week 6: Record of Tasks (return with new powers)
  6. flask-plateau          Full CRUD rebuild — your dress rehearsal

Each week builds on the last. The starter code always runs before you write anything. You never start from nothing.

This is a sequence of things to DO🔖

The concepts here are not hard one at a time. They become hard when you skip steps, fall behind, and have to learn three things at once. The bumpers are here. Stay in the lane.

How to use this workbook🔖

This is not a replacement for the live demo or the assignment repo. It's the reference you open when you're stuck at 10pm and need to remember what @app.route does, or why your function returns instead of prints.

Use the sidebar to navigate to your current week. Use the glossary (linked terms appear throughout) to look up any concept.