pockett.

Free, interactive Python. You pick a project (a car, a rocket, a drum machine) and your code makes it come alive: every lesson you pass bolts a new part onto a live demo. Python runs entirely in the browser (Pyodide / WebAssembly); there is no code-execution server, and no account is needed (an optional free account syncs progress).

pnpm install
pnpm dev          # http://localhost:3000
pnpm typecheck    # tsc
pnpm validate     # runs every lesson's solution + starter through the real Python engine
pnpm build

What's in the box

Project	Python concepts	Comes alive
🏎️ Turbo Garage	print, variables, math, functions, if/else, loops, lists, dicts, classes	a car you can drive, then an autopilot you write
🚀 Launch Control	loops, math, functions, conditionals, dicts, classes	a rocket flight to orbit
🥁 Beat Lab	strings, lists, loops, functions, dicts, classes	a synthesized drum machine

Plus a dashboard (XP, streak, badges) and a free-play Python sandbox.

How a "living project" works

1. The learner edits one growing main.py per project. Each lesson appends a TODO to what they already wrote.
2. Run executes it in Pyodide, then grades it with the lesson's assert tests.
3. The result is a ProgramHandle: the scene reads plain values (program.num("top_speed", 120)) and calls the learner's functions (program.call("steer", left, right)) every frame.
4. Passing a lesson unlocks features (lesson.unlocks). Scenes render locked features as blueprints and unlocked ones fully alive.

See docs/ARCHITECTURE.md for the full picture, and docs/ADDING_A_PROJECT.md to build a new one.

Accounts

Learning needs no account: progress saves in the browser. A free account (Supabase Auth) syncs progress, code and streaks across devices; see supabase/migrations/ and docs/ARCHITECTURE.md.