for i in range(n):while True:print(i)x = [1, 2, 3]def loop():i += 1

Learning is a never-ending loop.

Learn to code by watching concepts move. No walls of text, no static diagrams — every idea is an animation that plays out so you see what happens, step after step.

Start the loop →
loop.pyrunning
total = 0
for i in range(5):
total += i
range(5)
0
1
2
3
4
i
–
total
0

See it, don't read it

Arrays fill, pointers walk, loops iterate. Concepts animate so the mechanics are obvious.

Plays as you scroll

Animations trigger when you reach them, at reading pace — with a replay whenever you want.

Run it yourself

Edit and run real Python right in the browser — no setup, instant output — then lock it in with a quick quiz.