Question 1

Is the Tries — the prefix tree behind autocomplete lesson free?

Accepted Answer

Yes. The first 5 lessons on PyRun are free forever — no signup, no card. Tries — the prefix tree behind autocomplete runs real Python in your browser via Pyodide.

Question 2

How long does the Tries — the prefix tree behind autocomplete lesson take?

Accepted Answer

About 13 minutes end-to-end. It's a hands-on lesson — you read a paragraph, edit the code, and run it in the same tab.

Question 3

Do I need to install Python to try the Tries — the prefix tree behind autocomplete lesson?

Accepted Answer

No install required. PyRun runs real CPython in your browser via Pyodide (Python compiled to WebAssembly). Works on Chrome, Firefox, Safari, and Edge — desktop or mobile.

Question 4

What level is the Tries — the prefix tree behind autocomplete lesson?

Accepted Answer

Advanced level. Assumes comfort with classes, functions, and standard library. Not for first-time Python learners.