OOPS - Interview Questions in python

OOPs (Object-Oriented Programming) Interview Questions in Python 1) What is Object-Oriented Programming (OOP)? OOP is a programming paradigm based on the concept of objects, which contain data (attributes) and methods (functions). It allows for code reusability, modularity, and abstraction. Key principles of OOP: Encapsulation : Hiding data inside a class and restricting direct access. Abstraction : Hiding implementation details and exposing only necessary parts. Inheritance : Reusing code by creating a new class from an existing one. Polymorphism : Having multiple forms of the same method (overloading & overriding). 2) What is a Class and an Object? A class is a blueprint/template for creating objects. An object is an instance of a class. 3) What is Encapsulation? --> Encapsulation is the process of hiding data within a class and only allowing controlled access via methods. --> In Python, we use private attributes (__varname) to enforce encapsulation. 4) What is Inheritance? Inheritance allows a class (child class) to inherit attributes and methods from another class (parent class). Types of inheritance: Single Inheritance → A child class inherits from a single parent class. Multiple Inheritance → A child class inherits from multiple parent classes. Multilevel Inheritance → A child class inherits from a parent class, which itself inherits from another parent. Hierarchical Inheritance → Multiple child classes inherit from a single parent class. Hybrid Inheritance → A mix of two or more types of inheritance (e.g., multiple + multilevel). 5) What is Polymorphism? Polymorphism allows different classes to use the same method name but behave differently. 6) What is Abstraction? --> Abstraction means hiding implementation details and exposing only the required functionalities using abstract classes. --> Python provides ABC (Abstract Base Class) to achieve abstraction. 7) What is the difference between Method Overloading and Method Overriding? Method overloading : Same method name with different parameters in the same class. Method Overriding : Same method name and same parameters in a parent-child relationship (Inheritance).

Mar 17, 2025 - 10:10

OOPs (Object-Oriented Programming) Interview Questions in Python

1) What is Object-Oriented Programming (OOP)?

OOP is a programming paradigm based on the concept of objects, which contain data (attributes) and methods (functions). It allows for code reusability, modularity, and abstraction.

Key principles of OOP:

Encapsulation : Hiding data inside a class and restricting direct access.
Abstraction : Hiding implementation details and exposing only necessary parts.
Inheritance : Reusing code by creating a new class from an existing one.
Polymorphism : Having multiple forms of the same method (overloading & overriding).

2) What is a Class and an Object?

A class is a blueprint/template for creating objects.
An object is an instance of a class.

3) What is Encapsulation?

--> Encapsulation is the process of hiding data within a class and only allowing controlled access via methods.
--> In Python, we use private attributes (__varname) to enforce encapsulation.

4) What is Inheritance?

Inheritance allows a class (child class) to inherit attributes and methods from another class (parent class).

Types of inheritance:

Single Inheritance → A child class inherits from a single parent class.
Multiple Inheritance → A child class inherits from multiple parent classes.
Multilevel Inheritance → A child class inherits from a parent class, which itself inherits from another parent.
Hierarchical Inheritance → Multiple child classes inherit from a single parent class.
Hybrid Inheritance → A mix of two or more types of inheritance (e.g., multiple + multilevel).

5) What is Polymorphism?

Polymorphism allows different classes to use the same method name but behave differently.

6) What is Abstraction?

--> Abstraction means hiding implementation details and exposing only the required functionalities using abstract classes.
--> Python provides ABC (Abstract Base Class) to achieve abstraction.

7) What is the difference between Method Overloading and Method Overriding?

Method overloading : Same method name with different parameters in the same class.
Method Overriding : Same method name and same parameters in a parent-child relationship (Inheritance).