Object-Oriented Programming: Polymorphism and Inheritance

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Questions and Answers

What is the primary purpose of method overriding in polymorphism?

To create a new method in the child class
To modify the parent class code
To extend the functionality of an inherited method (correct)
To delete the parent class method

What happens when we call a method in polymorphism?

Python checks the parent class type
Python checks the child class type
Python checks the object’s class type (correct)
Python checks the method name

What is the advantage of method overriding when a parent class has multiple child classes?

It allows one child class to redefine the method while others use the parent class method (correct)
It allows all child classes to have the same method implementation
It allows the parent class to have multiple methods
It allows all child classes to modify the parent class code

What is the process of re-implementing the inherited method in the child class known as?

Method Overriding (B) Signup and view all the answers

What is the main concept used with inheritance in polymorphism?

Method Overriding (A) Signup and view all the answers

What is the benefit of using method overriding in polymorphism when the method inherited from the parent class doesn’t fulfill the need of a child class?

We can re-implement the method in the child class in a different way (A) Signup and view all the answers

What is the primary advantage of using inheritance in programming?

To promote the reusability of code (C) Signup and view all the answers

What is the relationship between a Car class and a Vehicle class in the example provided?

Car is a child class and Vehicle is a parent class (B) Signup and view all the answers

What is polymorphism in the context of object-oriented programming?

A concept that allows for the same function to act differently depending on the context (D) Signup and view all the answers

What is the main difference between method overloading and method overriding?

Method overloading is used when multiple methods have the same name but different parameters, while method overriding is used when a subclass provides a different implementation of a method from its parent class (D) Signup and view all the answers

What is the purpose of the parent class in inheritance?

To provide a blueprint for the child class (B) Signup and view all the answers

What is the result of a child class inheriting the properties of a parent class?

The child class acquires all the data members, properties, and functions from the parent class (B) Signup and view all the answers

What is the primary benefit of using the super() function in Python?

To enable code reusability and simplify access to parent class methods (D) Signup and view all the answers

What is the concept called when a child class redefines a method with the same name, parameters, and return type as a method in its parent class?

Method Overriding (B) Signup and view all the answers

What is an example of polymorphism in real-life?

A person acting as an employee and a wife (D) Signup and view all the answers

How does the built-in function len() exhibit polymorphism in Python?

It calculates the length of an object based on its type (D) Signup and view all the answers

What is the primary purpose of method overriding in Python?

To provide additional functionality to a parent class method (C) Signup and view all the answers

What is the key characteristic of polymorphism in Python?

Ability to perform the same action in different ways (A) Signup and view all the answers

Why is method overriding an essential concept in object-oriented programming?

It enables polymorphism and allows for more flexibility in coding (C) Signup and view all the answers

What is the result of using the super() function in a child class?

The child class accesses the parent class methods without specifying the parent class name (C) Signup and view all the answers

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Study Notes

Polymorphism with Inheritance

Polymorphism is mainly used with inheritance, allowing child classes to override methods of parent classes with the same name.
Method overriding is the process of re-implementing an inherited method in a child class in a different way.

Inheritance

Inheritance is the process of inheriting properties of a parent class into a child class.
The parent class is also called the base class, and the child class is also called the subclass or derived class.
The main purpose of inheritance is the reusability of code.
A child class acquires all data members, properties, and functions from the parent class.
A child class can also provide its specific implementation to the methods of the parent class.

Benefits of Inheritance

Code reusability, as we can use the existing class to create a new class instead of creating it from scratch.

Python super() Function

The super() function is used to refer to the parent class in a child class.
Benefits of using the super() function include:
- No need to remember or specify the parent class name to access its methods.
- Can be used in both single and multiple inheritances.
- Supports code reusability as there is no need to write the entire function.

Method Overriding

Method overriding is the concept of redefining a method in a child class that has the same name, same parameters, and same return type as a method in its superclass.
The child class can extend additional functions in the child class that are not available in the parent class.
Example: a child class Car redefines the method max_speed() that is available in the parent class Vehicle.

Polymorphism in Python

Polymorphism in Python is the ability of an object to take many forms.
It allows us to perform the same action in many different ways.
Example: the built-in function len() calculates the length of an object depending upon its type, such as a string or a list.

Module 5 Objectives

Define Inheritance and Polymorphism.
Discuss the syntax and program structure of Inheritance.
Demonstrate application programs on inheritance.
Discuss the types of inheritance.
Demonstrate application programs on the different types of inheritance.
Introduce the concept of polymorphism.
Discuss the concept of overloading and Overriding.
Demonstrate application programs on overloading and overriding.

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