Lesson 12 · Dictionaries · Part 3 — Level II · Guide

August 6, 2026 · Bridge Academy Python Program

Learning goals

• Model scientific and real-world records with nested dictionaries.
• Represent a gene as {"chromosome": "Y", "bases": 2400} inside a lookup by gene name.
• Store multi-level sports statistics (player → season → stat).
• Reach a nested value with chained bracket lookups.
• Append to and update inner lists inside dictionaries.

This lesson covers PCEP-30-02 objective 3.3.