Lesson 4 — Loop + list: The Power Duo

Level: Apprentice — roughly Grade 7 / ages 12–13 Duration: 25–30 minutes Format: Write real Python in the browser (runs instantly, nothing to install) Concept: for picks items out of a list one by one, no manual indexing — 4 items or 4 million, the code stays the same

Learning Objective

Kids use for to visit every list member and accumulate values while looping (summing scores, counting) — the two moves real programs use most.

Do It Together (Parent-Child Co-participation)

Put one day's real family expenses (4–5 items, rounded) into a list and have your child loop-sum it — does it match the calculator every time?