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Lesson 7.03: Methods

Learning Objectives

Students will be able to...

  • Define and identify: method, __str__, __add__, operator overloading.
  • Create a class with an __init__ method.
  • Understand and use the self argument.
  • Instantiate a class with an argument.

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 will find that when they try to print the two different Time objects, it produces output that's not particularly useful or readable.
  • Students will also discover that adding objects doesn't work...yet!

2. Lesson

Instruction - Method

  • a function inside of a class.
  • The first argument is always self.

Discussion

  • Ask students what method we have already seen and used previously. (init)
  • Ask students how they would distinguish between the two time variables.

Instruction - __str__

  • Need a method called __str__.
  • This will get called when you print an object.
  • it returns a string that is easy to read and understand.

Activity

  • Have the students practice writing __str__ for the Time class for 5 minutes.
  • Have a student write up their string method on the board.

Instruction __add__

  • A method that gets called when the plus sign is used between two Time objects.
  • In this case it takes as parameters self and another Time object and returns a Time object that is the sum of both.
  • Overwriting add is called operator overloading because you are re-writing the code used to make the + work.

Demonstration

  • Work together with students to come up with the add time algorithm.

3. Lab

  • Have students finish up the time adding method.
  • Have students work on kangaroo lab.

4. Debrief

  • Go over students' questions and demonstrate some students' successfully completed labs.
  • Review what a method is, as well as what specific methods were used in today's lab.

Accommodation/Differentiation

Students that are moving quickly should work on the bonus assignment in the lab or assist a partner that is struggling.