Method invocation flow in Python - Mini Project: Build & Apply

Method Invocation Flow

📖 Scenario: Imagine you have a simple robot that can greet people and say goodbye. You want to organize its actions using methods inside a class.

🎯 Goal: You will create a class with methods and then call these methods in the right order to see the robot greet and say goodbye.

📋 What You'll Learn

Create a class called Robot

Add a method called greet that prints 'Hello!'

Add a method called say_goodbye that prints 'Goodbye!'

Create an instance of Robot called my_robot

Call the greet method on my_robot

Call the say_goodbye method on my_robot

💡 Why This Matters

🌍 Real World

Classes and methods help organize code for robots, games, apps, and many programs that need actions grouped together.

💼 Career

Understanding how to define and call methods in classes is a key skill for software developers working on object-oriented programming.

1

Create the Robot class

Create a class called Robot with no methods inside.

Python

# Your code here

Need a hint?

A class is created using the class keyword followed by the class name and a colon.

2

Add greet and say_goodbye methods

Inside the Robot class, add a method called greet that prints 'Hello!' and another method called say_goodbye that prints 'Goodbye!'.

Python

class Robot:
    # Your code here

Need a hint?

Methods inside a class need self as the first parameter. Use print() to show messages.

3

Create an instance of Robot

Create an instance of the Robot class called my_robot.

Python

class Robot:
    def greet(self):
        print('Hello!')

    def say_goodbye(self):
        print('Goodbye!')

# Your code here

Need a hint?

To create an object, write the class name followed by parentheses.

4

Call greet and say_goodbye methods

Call the greet method on my_robot and then call the say_goodbye method on my_robot.

Python

class Robot:
    def greet(self):
        print('Hello!')

    def say_goodbye(self):
        print('Goodbye!')

my_robot = Robot()
# Your code here

Need a hint?

Use dot notation to call methods on an object, like my_robot.greet().