Outline:

0. Questions?
1. Features of object-oriented design
   • encapsulation
   • polymorphism
   • inheritance
2. Inheritance
   • parent and child classes (aka superclasses and subclasses)
   • Exercise 1: exploring graphics.py
   • is-a versus has-a

Explore after class:

3. Reading code with inheritance
   • Exercise 2

What’s next

Upcoming events/assessments:

• CS Bits and Bytes Thursday at 3:30pm in Anderson 329: Meditech
• Homework assignment 7 is all about classes and dictionaries and due this Thursday
• Quiz #4 will be on Friday (in Olin 149)

What you should do now:

• The readings (see below)
• Work on Assignment 7

Reading assignment (to be completed by the next class):

• Zelle sections 13.5–13.6 (pp. 463–467)