Prepare Smarter for Your Next Python Exam!
This page brings you a carefully curated set of 50 Python and Object-Oriented Programming (OOPs) interview questions designed for aspiring Data Analysts and Data Scientists. Covering easy, intermediate, and hard-level MCQs, these questions test your understanding of Python fundamentals, OOP principles, and advanced coding concepts that are essential for solving real-world data problems. Whether you’re brushing up before an interview or strengthening your technical foundation, this collection will help you practice, revise, and build confidence in core programming skills for data-driven careers.

Name

Email

Course

Phone

What is the output of print(2**3)?

9

6

8

Error

What does is operator check in Python?

Type check

Identity (same object in memory)

None of the above

Value equality

What will this code output? 2 Marks

c) Error

d) None

b) [1], [1,2], [1,2,3]

a) [1], [2], [3]

Which of the following is not a valid Python keyword?

finally

async

lambda

var

Which keyword is used to inherit from a parent class? 2 Marks

extends

class Child(Parent)

super

parent

What will this print? 5 Marks

Error

[[1], [1,2], [2,3], [3,4]]

[[1], [2], [3], [4]]

[[1], [1,1], [1,2,1], [1,3,3,1]]

Which OOP principle hides implementation details from the user?

Abstraction

Encapsulation

Polymorphism

Inheritance

What will be printed? 5 Marks

A

Error

B

C

What will this output? 5 Marks

[2, 4, 6, 8, 10]

[2, 3, 5, 7]

[2, 3, 5, 7, 9]

Error

Which of the following is true about Python memory management?

Python variables must be declared with types before use

Memory is released only when program terminates

Python uses a garbage collector for automatic memory management

Python does not allow dynamic memory allocation

What will print("Data"[::-1]) return? 2 Marks

Error

Data

Dtaa

ataD

Which of the following defines a constructor in Python?

__construct__

__new__

__init__

init()

Which method in OOP is automatically called when an object is created? 2 Marks

__call__

__init__

__del__

__str__

What will be the output? 2 Marks

Error

[0, 1, 1, 2, 3]

[0, 1, 2, 3, 4]

[1, 1, 2, 3, 5]

In multiple inheritance, the “diamond problem” arises when: 2 Marks

a) Two classes inherit from the same class and a third inherits from both

d) Two classes share the same constructor

b) Classes contain same method names with different arguments

c) Functions call themselves recursively

Which function returns the length of a list?

count()

size()

length()

len()

What is the default return type of input() function in Python?

str

int

float

bool

Which OOP concept is used in method overriding? 2 Marks

d) Both a and c

a) Polymorphism

b) Encapsulation

c) Inheritance

In Python, strings are:

Immutable

Both

None

Mutable

Which of the following statements about Python modules is correct?

c) Both (a) and (b)

b) A package is a collection of modules organized in a directory

d) Neither (a) nor (b)

a) A module is a single file containing Python definitions and statements

Which of the following collections in Python is immutable?

Dictionary

Set

Tuple

List

Which method is automatically called when an object is deleted? 2 Marks

close

init

del

destroy()

What is the correct way to define a function in Python?

def myfunc():

func myfunc():

function myfunc():

define myfunc():

Which Python feature supports multiple forms of a function name? 2 Marks

Method overloading

Generators

Polymorphism

Duck typing

Which of the following is a valid Python data type?

tuple, set

int, str, float

All of the above

bool, list, dict

What is the output of bool("")?

False

None

Error

True

What will be the output of this program? 5 Marks

101

Not defined

Error

None

What will this output? 2 Marks

False

None

Error

True

Which function converts a list into a set?

dict()

tuple()

list()

set()

Which special method is used to represent an object as a string? 2 Marks

repr

print

str

format

Which decorator defines a method that does not take self or cls? 2 Marks

@classmethod

@abstractmethod

@staticmethod

@property

Which OOP concept allows multiple methods with the same name but different behavior? 2 Marks

Inheritance

Polymorphism

Abstraction

Encapsulation

What will type(3.0) return?

decimal

float

double

int

Which of these allows creating private attributes in Python? 2 Marks

c) Use @private

a) Start attribute name with __

b) Start attribute name with _

d) Not possible

Which operator is used for floor division in Python?

%

//

**

/

Which of the following best describes Pickling in Python? 2 Marks

Encrypting Python code

Converting Python objects into byte stream for storage/transfer

Making code portable

Compressing data files

Python – Global Interpreter Lock (GIL)

Is not used in CPython

Prevents multiple native threads from executing Python bytecodes simultaneously

Allows true parallel execution of threads

Enhances multiprocessing

What does self represent in Python classes? 2 Marks

A function pointer

The class itself

The instance of the class

A global variable

Which statement is correct regarding Python exceptions?

b) The finally block always executes regardless of an exception

a) Python does not support exception handling

d) Exceptions cannot be user-defined

c) Only one except block is allowed per try

Python OOPs Interview Questions Exam