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 bool("")?

Error

False

True

None

Which function converts a list into a set?

set()

dict()

list()

tuple()

Which function returns the length of a list?

count()

size()

len()

length()

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

@staticmethod

@classmethod

@abstractmethod

@property

Which statement is correct regarding Python exceptions?

b) The finally block always executes regardless of an exception

d) Exceptions cannot be user-defined

c) Only one except block is allowed per try

a) Python does not support exception handling

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

c) Use @private

d) Not possible

a) Start attribute name with __

b) Start attribute name with _

Which of the following is not a valid Python keyword?

var

finally

async

lambda

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

d) Two classes share the same constructor

b) Classes contain same method names with different arguments

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

c) Functions call themselves recursively

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

Inheritance

Abstraction

Encapsulation

Polymorphism

Which OOP principle hides implementation details from the user?

Abstraction

Inheritance

Polymorphism

Encapsulation

Which of the following is a valid Python data type?

bool, list, dict

tuple, set

int, str, float

All of the above

Which of the following collections in Python is immutable?

List

Dictionary

Set

Tuple

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

Data

Error

ataD

Dtaa

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

extends

super

class Child(Parent)

parent

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

__init__

__str__

__call__

__del__

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

init

destroy()

del

close

What will be printed? 5 Marks

A

Error

B

C

What does self represent in Python classes? 2 Marks

A function pointer

A global variable

The class itself

The instance of the class

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

Encrypting Python code

Compressing data files

Making code portable

Converting Python objects into byte stream for storage/transfer

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

d) None

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

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

c) Error

In Python, strings are:

Immutable

Both

Mutable

None

What will this output? 5 Marks

Error

[2, 4, 6, 8, 10]

[2, 3, 5, 7, 9]

[2, 3, 5, 7]

What will this output? 2 Marks

False

None

True

Error

What will be the output? 2 Marks

[0, 1, 2, 3, 4]

[0, 1, 1, 2, 3]

[1, 1, 2, 3, 5]

Error

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

float

int

bool

str

Which of the following is true about Python memory management?

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

Python does not allow dynamic memory allocation

Python – Global Interpreter Lock (GIL)

Allows true parallel execution of threads

Prevents multiple native threads from executing Python bytecodes simultaneously

Enhances multiprocessing

Is not used in CPython

What does is operator check in Python?

None of the above

Value equality

Type check

Identity (same object in memory)

Which OOP concept is used in method overriding? 2 Marks

d) Both a and c

a) Polymorphism

b) Encapsulation

c) Inheritance

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

Method overloading

Generators

Polymorphism

Duck typing

Which of the following statements about Python modules is correct?

d) Neither (a) nor (b)

c) Both (a) and (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

What will be the output of this program? 5 Marks

101

None

Error

Not defined

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

format

repr

str

print

Which operator is used for floor division in Python?

//

**

%

/

What will type(3.0) return?

decimal

float

double

int

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

define myfunc():

function myfunc():

def myfunc():

func myfunc():

Which of the following defines a constructor in Python?

__new__

__construct__

__init__

init()

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

6

Error

8

9

Python OOPs Interview Questions Exam