Lesson 16 · Data Iteration · Part 4 — Level II · Guide

September 10, 2026 · Bridge Academy Python Program

Learning goals

• Walk a string with enumerate() to get both index and character.
• Accumulate characters into a new string with classification rules.
• Apply character-by-character transforms (Caesar shifts, case folding, DNA transcription).
• Combine two iterables with zip() over parallel strings.

This lesson covers PCEP-30-02 objective 2.2.