Python Reading

• Read the chapter entitled Classes and Objects - Digging Deeper: from section "Sameness" to section "Arithmetic Methods"

Guest Lecture

Computer Science Ph.D. student Isaac Griffith will give today's lecture. John is attending a conference.

Key Ideas

• Shallow Equality occurs when two variables refer to the same object in the computer's memory. The python keyword is tests for shallow equality.
• Deep Equality occurs when either there is shallow equality OR two variables refer to objects that contain the same underlying (significant) values.
• The method __add__(self, other) can be defined so that the operator + can be used.

In-Class Activity

• Consider dungeons.py.
• Draw a picture that demonstrates shallow equality of two Humans.
• Modify the program above to demonstrate your understanding of shallow equality using the Python keyword is.
• Draw a picture that demonstrates deep equality of two Humans.

Active Learning

• Modify the program above to add a function that illustrates your understanding of deep equality.
• Modify fraction.py to use method __add__(self, other_fraction) instead of method add(self, other_fraction).