Question 1

Is the Topological Sort — ordering DAGs lesson free?

Accepted Answer

Yes. The first 5 lessons on PyRun are free forever — no signup, no card. Topological Sort — ordering DAGs runs real Python in your browser via Pyodide.

Question 2

How long does the Topological Sort — ordering DAGs lesson take?

Accepted Answer

About 12 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 Topological Sort — ordering DAGs 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 Topological Sort — ordering DAGs lesson?

Accepted Answer

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