Lesson 18 · Data Iteration · Part 6 — Level II · Guide

September 24, 2026 · Bridge Academy Python Program

Learning goals

• Traverse a matrix (list of lists) with nested loops.
• Use for-else and while-else to express "no break taken".
• Break cleanly out of an inner loop; combine with an outer flag to exit both.
• Combine per-row aggregation with per-column work in the same pass.

This lesson covers PCEP-30-02 objective 2.2.