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Lesson 7.02: User-Defined Types, Part 2

Learning Objectives

Students will be able to...

  • Define and identify: self, __init__.
  • Create a class with an init method.
  • Understand and use the self argument.
  • Instantiate a class with arguments.

Materials/Preparation

Pacing Guide

Duration Description
5 Minutes Do Now
10 Minutes Lesson
35 Minutes Lab
5 Minutes Debrief

Instructor's Notes

1. Do Now

  • Display the Do Now on the board.
  • Students use the __init__ method and explore how to initialize new objects with one or more arguments.

2. Lesson

Discuss the Do Now

  • Ask Students the following:
    • What is the name of the class?
    • Where does the Pet object get instantiated?

Instruction - __init__

  • __init__ is a special function that is called when the class is first initialized.
  • If there is a print statement added to the __init__ method, when would it get printed?

Instruction - self

  • self is a way of referring to the instance within a function.
  • What does self.name do and how does that relate to what my_pet.name does?
  • Previously we had added attributes after the class was instantiated, but self allows for us to assign those at once in a single method.

3. Lab

  • Students will make a Pet class. Each pet will have an animal type, color, food, noise, and name.
  • Next students write a function that will take a list of pets and print out their name and the food they like to eat.

4. Debrief

  • Check for student understanding and completion of the lab.
  • Review the two key concepts introduced today (self and __init__).

Accommodation/Differentiation

As with the previous lesson, be prepared for some students to struggle with the new vocabulary and concepts being introduced. Reinforce the use of vocabulary such as instantiate, object, and attribute so that students are consistently exposed to how to use these terms.