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 will this output? 2 Marks

Error

True

False

None

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

repr

format

str

print

Which OOP concept is used in method overriding? 2 Marks

c) Inheritance

d) Both a and c

a) Polymorphism

b) Encapsulation

Which operator is used for floor division in Python?

**

%

/

//

What will this print? 5 Marks

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

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

Error

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

What will this code output? 2 Marks

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

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

c) Error

d) None

Which of the following defines a constructor in Python?

init()

__init__

__new__

__construct__

What does is operator check in Python?

Value equality

Type check

None of the above

Identity (same object in memory)

What will type(3.0) return?

decimal

int

double

float

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

b) Start attribute name with _

d) Not possible

a) Start attribute name with __

c) Use @private

What does self represent in Python classes? 2 Marks

A global variable

A function pointer

The class itself

The instance of the class

In Python, strings are:

None

Immutable

Mutable

Both

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

super

class Child(Parent)

parent

extends

What will this output? 5 Marks

[2, 3, 5, 7]

[2, 3, 5, 7, 9]

Error

[2, 4, 6, 8, 10]

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

@property

@classmethod

@abstractmethod

@staticmethod

Which function converts a list into a set?

dict()

tuple()

set()

list()

Python – Global Interpreter Lock (GIL)

Allows true parallel execution of threads

Prevents multiple native threads from executing Python bytecodes simultaneously

Is not used in CPython

Enhances multiprocessing

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

b) Classes contain same method names with different arguments

d) Two classes share the same constructor

c) Functions call themselves recursively

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

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

Generators

Duck typing

Polymorphism

Method overloading

What will be the output? 2 Marks

Error

[0, 1, 1, 2, 3]

[1, 1, 2, 3, 5]

[0, 1, 2, 3, 4]

What will be the output of this program? 5 Marks

None

Not defined

101

Error

Which of the following is true about Python memory management?

Python does not allow dynamic memory allocation

Python variables must be declared with types before use

Python uses a garbage collector for automatic memory management

Memory is released only when program terminates

Which of the following is a valid Python data type?

tuple, set

All of the above

int, str, float

bool, list, dict

Which statement is correct regarding Python exceptions?

c) Only one except block is allowed per try

b) The finally block always executes regardless of an exception

a) Python does not support exception handling

d) Exceptions cannot be user-defined

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

str

float

int

bool

What will be printed? 5 Marks

Error

B

A

C

Which OOP principle hides implementation details from the user?

Inheritance

Abstraction

Encapsulation

Polymorphism

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

define myfunc():

function myfunc():

func myfunc():

def myfunc():

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

ataD

Dtaa

Data

Error

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

Converting Python objects into byte stream for storage/transfer

Encrypting Python code

Making code portable

Compressing data files

Which of the following is not a valid Python keyword?

finally

async

lambda

var

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

destroy()

init

close

del

Which function returns the length of a list?

len()

count()

length()

size()

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

9

Error

8

6

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

Inheritance

Polymorphism

Abstraction

Encapsulation

Which of the following collections in Python is immutable?

Tuple

List

Dictionary

Set

What is the output of bool("")?

None

Error

False

True

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

__str__

__call__

__init__

__del__

Which of the following statements about Python modules is correct?

c) Both (a) and (b)

d) Neither (a) nor (b)

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

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

Python OOPs Interview Questions Exam