Lesson 10 · Dictionaries · Part 1 — Level II · Guide

July 23, 2026 · Bridge Academy Python Program

Learning goals

• Represent scientific and financial data as key-value pairs.
• Look up prices, populations, and atomic numbers by ticker, country, or element symbol.
• Add, update, and remove entries as data is corrected or refreshed.
• Validate inputs with "key" in d / "key" not in d.
• Report sample size with len(d).

This lesson covers PCEP-30-02 objective 3.3.