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

Error

6

8

What is the output of bool("")?

Error

None

True

False

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

__call__

__del__

__init__

__str__

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

Dtaa

ataD

Data

Error

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

parent

class Child(Parent)

extends

super

What will this print? 5 Marks

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

Error

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

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

In Python, strings are:

Mutable

None

Immutable

Both

Which OOP concept is used in method overriding? 2 Marks

b) Encapsulation

d) Both a and c

a) Polymorphism

c) Inheritance

What will type(3.0) return?

decimal

double

float

int

Which of the following is a valid Python data type?

bool, list, dict

All of the above

int, str, float

tuple, set

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

Which of the following collections in Python is immutable?

Tuple

Dictionary

List

Set

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

@classmethod

@staticmethod

@abstractmethod

@property

What will be printed? 5 Marks

A

Error

B

C

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

bool

str

float

int

What does is operator check in Python?

Value equality

None of the above

Identity (same object in memory)

Type check

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

d) Two classes share the same constructor

c) Functions call themselves recursively

b) Classes contain same method names with different arguments

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

Which operator is used for floor division in Python?

/

%

**

//

What will this output? 5 Marks

[2, 4, 6, 8, 10]

Error

[2, 3, 5, 7]

[2, 3, 5, 7, 9]

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

Polymorphism

Generators

Method overloading

Duck typing

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

close

destroy()

del

init

What will be the output? 2 Marks

[0, 1, 2, 3, 4]

[1, 1, 2, 3, 5]

[0, 1, 1, 2, 3]

Error

What will be the output of this program? 5 Marks

Not defined

None

101

Error

Which of the following statements about Python modules is correct?

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

c) Both (a) and (b)

Which function returns the length of a list?

count()

size()

len()

length()

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

Inheritance

Polymorphism

Abstraction

Encapsulation

Which function converts a list into a set?

dict()

list()

set()

tuple()

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

repr

str

format

print

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

def myfunc():

func myfunc():

define myfunc():

function myfunc():

What will this output? 2 Marks

False

True

None

Error

Which of the following is not a valid Python keyword?

async

var

finally

lambda

What does self represent in Python classes? 2 Marks

The instance of the class

A function pointer

A global variable

The class itself

Python – Global Interpreter Lock (GIL)

Prevents multiple native threads from executing Python bytecodes simultaneously

Allows true parallel execution of threads

Enhances multiprocessing

Is not used in CPython

Which statement is correct regarding Python exceptions?

a) Python does not support exception handling

d) Exceptions cannot be user-defined

c) Only one except block is allowed per try

b) The finally block always executes regardless of an exception

What will this code output? 2 Marks

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

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

d) None

c) Error

Which of the following defines a constructor in Python?

__construct__

__new__

init()

__init__

Which OOP principle hides implementation details from the user?

Encapsulation

Abstraction

Polymorphism

Inheritance

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

d) Not possible

a) Start attribute name with __

b) Start attribute name with _

c) Use @private

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

Encrypting Python code

Converting Python objects into byte stream for storage/transfer

Compressing data files

Making code portable

Python OOPs Interview Questions Exam