Lesson: User Defined Types

Learning Objectives

Students will be able to...

• Define and identify: class, instance, object, attributes
• Create a class and instantiate
• Add attributes to an instance
• Use attributes and class

Materials/Preparation

• Do Now
• Example
• Lab
• Associated Reading - section 6.1 of Book
• Read through the handout, lesson, and lab so that you are familiar with the requirements and can assist students

Pacing Guide

Instructor's Note

1. Do Now
   • Display the Do Now on the board.
2. Lesson
   • Discuss Do Now
     • Ask the students what data type they thought would be helpful? Ask how they would print the full names.
     • Need something that says "I am type Pet"
   • class: a user defined type.
     • On board write syntax for creating a class: class Pet(object):
     • object : basis of object oriented programming. objects correspond to a real world object
     • instantiated: can create instances of a class by using Pet(). If you check the type of an instance it will be Pet
     • instances are mutable, they can be changed or updated
   • show Example on board.
     • Ask students what the difference is between this and the do now
     • Ask the students where the class is created.
     • Ask the students where the class is instantiated
       • Ask students what they think pet.full_name will do
         • explain concept of attribute
         • attribute: values assigned to an instance
   • can also create functions that take in classes and use their attributes
3. Lab
   • Students will create RGB colors using class.
   • Create a function to merge two colors.
   • Check up their colors on a rgb website
4. Debrief
   • Talk about any of the phrases or issues the students had. Did they find it easy to understand the code when they read it.