Method Resolution Order (MRO) in Python - Mini Project: Build & Apply

Understanding Method Resolution Order (MRO) in Python

📖 Scenario: Imagine you have a set of classes representing different types of vehicles. Some vehicles share common features, and some features come from multiple sources. You want to understand how Python decides which feature to use when there are multiple options.

🎯 Goal: You will create a set of classes with multiple inheritance and use Python's Method Resolution Order (MRO) to see how Python chooses which method to run.

📋 What You'll Learn

Create classes with inheritance

Use the super() function

Print the MRO of a class

Call methods to observe which one runs

💡 Why This Matters

🌍 Real World

Understanding MRO helps when working with complex class hierarchies, such as in frameworks or libraries that use multiple inheritance.

💼 Career

Many software development jobs require knowledge of object-oriented programming and how Python resolves methods in multiple inheritance scenarios.

1

Create base classes with a method

Create two classes called Car and Boat. Each class should have a method called move that prints exactly "Car is moving" and "Boat is moving" respectively.

Python

# Your code here

Need a hint?

Define two classes with a method named move. Each method should print a different message.

2

Create a class with multiple inheritance

Create a class called AmphibiousVehicle that inherits from Car and Boat. Do not add any methods inside it.

Python

class Car:
    def move(self):
        print("Car is moving")

class Boat:
    def move(self):
        print("Boat is moving")

# Your code here

Need a hint?

Define AmphibiousVehicle with Car and Boat inside parentheses to inherit from both.

3

Print the Method Resolution Order (MRO)

Print the MRO of the AmphibiousVehicle class using AmphibiousVehicle.__mro__.

Python

class Car:
    def move(self):
        print("Car is moving")

class Boat:
    def move(self):
        print("Boat is moving")

class AmphibiousVehicle(Car, Boat):
    pass

# Your code here

Need a hint?

Use print(AmphibiousVehicle.__mro__) to see the order Python looks for methods.

4

Create an instance and call the method

Create an instance called vehicle of AmphibiousVehicle and call its move() method. Print the output.

Python

class Car:
    def move(self):
        print("Car is moving")

class Boat:
    def move(self):
        print("Boat is moving")

class AmphibiousVehicle(Car, Boat):
    pass

print(AmphibiousVehicle.__mro__)

# Your code here

Need a hint?

Create vehicle = AmphibiousVehicle() and then call vehicle.move() to see which method runs.