What a rung is, versus a notebook
P39.reading-code.01 · Audience: guest, language-pro, it-ml · Prerequisites: What an error is (and that it's fine)
You have now used several of these little graded boxes without anyone naming what they are. This module names them — so the platform stops feeling like it has hidden rules, and you know exactly what each surface is for.
ⓘ Concept: A rung is a cell with a goal attached
A rung is a small practice cell with a goal: it has a Run button that checks the visible tests and a Submit button that grades you. A plain notebook cell is a free space instead — you type and run code to explore, and nothing is graded. Under the hood both do the exact same thing: run Python and show you the result.
Why it matters — Knowing when you are being graded and when you are free to experiment removes the main anxiety a beginner feels on a learning platform.
Why name this at all
On paper, there is a difference between a graded exam and a scratch pad where you work things out. Same pen, same maths — different purpose. A rung is the exam question (with a goal and a check); a notebook cell is the scratch pad (free, unmarked). You have been climbing rungs; soon you will also have notebooks to play in.
Your turn
This rung is a confidence check, not a puzzle. Write, in two or three plain sentences, what a rung is and how it differs from an ordinary notebook cell. There is no code to run — a gentle grader reads your words, and the threshold is deliberately low. Putting the idea in your own words is what makes it stick.
Ask the mentor about this module
Ask a question about this content. The mentor explains and grounds its answer in what you are studying; asking is recorded as a learning signal, not a grade.
🎓 Practice ladder
1 graded rung · ~6 minA free-form rung: you write prose, press Submit, and a grader gives gentle feedback. No tests, no trick — just explain the idea as you understand it.
Explorer rung — explain a rung in your own words
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Where next?
Later in Reading Code
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