Python OOPS – Object Oriented Programming System Questions with Solutions

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Object-Oriented Programming (OOP) is a programming paradigm that organizes code using classes and objects. It makes programs more reusable, modular, and easier to maintain. In this practice set, you’ll learn the fundamentals of OOP in Python through beginner-friendly, Python OOPS – Object Oriented Programming System Questions with Solutions

1. Python Program to Create a Class and Object

Difficulty: Foundation

Problem Statement

Write a Python program to create a class named Student and print a student’s name using an object.

Python Solution

class Student:
    name = "John"

student = Student()

print(student.name)

Sample Output

John

Explanation

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

Concepts Covered

  • Class
  • Object

2. Python Program to Use the __init__() Constructor

Difficulty: Foundation

Problem Statement

Write a Python program to initialize a student’s name and age using the constructor.

Python Solution

class Student:

    def __init__(self, name, age):
        self.name = name
        self.age = age

student = Student("John", 20)

print(student.name)
print(student.age)

Sample Output

John
20

Explanation

The __init__() method is automatically called when an object is created.

Concepts Covered

  • Constructor
  • __init__()

3. Python Program to Create an Instance Method

Difficulty: Foundation

Problem Statement

Write a Python program to create an instance method that displays student information.

Python Solution

class Student:

    def __init__(self, name, course):
        self.name = name
        self.course = course

    def display(self):
        print("Name:", self.name)
        print("Course:", self.course)

student = Student("John", "Python")

student.display()

Sample Output

Name: John
Course: Python

Explanation

Instance methods use self to access object attributes.

Concepts Covered

  • Instance Method
  • self

4. Python Program to Create Multiple Objects

Difficulty: Foundation

Problem Statement

Write a Python program to create two objects of the same class.

Python Solution

class Student:

    def __init__(self, name):
        self.name = name

student1 = Student("John")
student2 = Student("Rahul")

print(student1.name)
print(student2.name)

Sample Output

John
Rahul

Explanation

A single class can create multiple independent objects.

Concepts Covered

  • Multiple Objects

5. Python Program to Demonstrate Inheritance

Difficulty: Practice

Problem Statement

Write a Python program where the Student class inherits from the Person class.

Python Solution

class Person:

    def show(self):
        print("I am a Person.")

class Student(Person):
    pass

student = Student()

student.show()

Sample Output

I am a Person.

Explanation

Inheritance allows one class to inherit properties and methods from another class.

Concepts Covered

  • Inheritance

6. Python Program to Override a Method

Difficulty: Practice

Problem Statement

Write a Python program to override a method in the child class.

Python Solution

class Animal:

    def sound(self):
        print("Animal Sound")

class Dog(Animal):

    def sound(self):
        print("Bark")

dog = Dog()

dog.sound()

Sample Output

Bark

Explanation

Method overriding allows a child class to provide its own implementation of a parent class method.

Concepts Covered

  • Method Overriding

7. Python Program to Demonstrate Encapsulation

Difficulty: Practice

Problem Statement

Write a Python program to create a private variable inside a class.

Python Solution

class Student:

    def __init__(self):
        self.__marks = 95

    def show_marks(self):
        print(self.__marks)

student = Student()

student.show_marks()

Sample Output

95

Explanation

A double underscore (__) makes an attribute private.

Concepts Covered

  • Encapsulation
  • Private Variables

8. Python Program to Demonstrate Polymorphism

Difficulty: Challenge

Problem Statement

Write a Python program to demonstrate polymorphism using two classes.

Python Solution

class Dog:

    def sound(self):
        print("Bark")

class Cat:

    def sound(self):
        print("Meow")

for animal in (Dog(), Cat()):
    animal.sound()

Sample Output

Bark
Meow

Explanation

Polymorphism allows different classes to have methods with the same name.

Concepts Covered

  • Polymorphism

9. Python Program to Check the Type of an Object

Difficulty: Challenge

Problem Statement

Write a Python program to check whether an object belongs to a class.

Python Solution

class Student:
    pass

student = Student()

print(isinstance(student, Student))

Sample Output

True

Explanation

The isinstance() function checks whether an object belongs to a specific class.

Concepts Covered

  • isinstance()

10. Python Program to Access Class Variables

Difficulty: Challenge

Problem Statement

Write a Python program to create and access a class variable.

Python Solution

class Student:

    school = "CodeMantra"

student1 = Student()
student2 = Student()

print(student1.school)
print(student2.school)

Sample Output

CodeMantra
CodeMantra

Explanation

Class variables are shared among all objects of a class.

Concepts Covered

  • Class Variables

Chapter Summary

After completing this chapter, you have learned:

  • Classes
  • Objects
  • Constructors
  • Instance Variables
  • Instance Methods
  • Inheritance
  • Method Overriding
  • Encapsulation
  • Polymorphism
  • Class Variables
  • isinstance()

Written by Shubhranshu Shekhar, who has trained 20000+ students in coding.

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