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

Which of the following collections in Python is immutable?

Dictionary

Tuple

List

Set

Which function converts a list into a set?

dict()

list()

tuple()

set()

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

__call__

__init__

__del__

__str__

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

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

b) Classes contain same method names with different arguments

c) Functions call themselves recursively

d) Two classes share the same constructor

What does self represent in Python classes? 2 Marks

The instance of the class

The class itself

A global variable

A function pointer

What will this code output? 2 Marks

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

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

d) None

c) Error

What is the output of bool("")?

Error

None

False

True

What will this output? 5 Marks

[2, 4, 6, 8, 10]

Error

[2, 3, 5, 7, 9]

[2, 3, 5, 7]

Which of the following is not a valid Python keyword?

async

var

finally

lambda

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

8

9

6

Error

What will be the output? 2 Marks

Error

[0, 1, 1, 2, 3]

[0, 1, 2, 3, 4]

[1, 1, 2, 3, 5]

What does is operator check in Python?

Value equality

Type check

Identity (same object in memory)

None of the above

What will this print? 5 Marks

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

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

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

Error

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

@abstractmethod

@classmethod

@staticmethod

@property

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

Inheritance

Polymorphism

Abstraction

Encapsulation

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 operator is used for floor division in Python?

**

%

/

//

Which function returns the length of a list?

len()

length()

count()

size()

Python – Global Interpreter Lock (GIL)

Enhances multiprocessing

Is not used in CPython

Prevents multiple native threads from executing Python bytecodes simultaneously

Allows true parallel execution of threads

What will type(3.0) return?

decimal

float

double

int

Which OOP principle hides implementation details from the user?

Polymorphism

Inheritance

Abstraction

Encapsulation

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

str

repr

format

print

What will be printed? 5 Marks

C

Error

B

A

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

b) Start attribute name with _

c) Use @private

d) Not possible

a) Start attribute name with __

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

parent

class Child(Parent)

extends

super

Which OOP concept is used in method overriding? 2 Marks

d) Both a and c

c) Inheritance

b) Encapsulation

a) Polymorphism

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

function myfunc():

def myfunc():

func myfunc():

define myfunc():

Which statement is correct regarding Python exceptions?

a) Python does not support exception handling

c) Only one except block is allowed per try

d) Exceptions cannot be user-defined

b) The finally block always executes regardless of an exception

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

Method overloading

Polymorphism

Generators

Duck typing

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

Data

ataD

Error

Dtaa

What will this output? 2 Marks

True

Error

False

None

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

int

str

float

bool

Which of the following is a valid Python data type?

int, str, float

All of the above

bool, list, dict

tuple, set

Which of the following defines a constructor in Python?

__init__

init()

__construct__

__new__

What will be the output of this program? 5 Marks

None

Error

Not defined

101

Which of the following statements about Python modules is correct?

d) Neither (a) nor (b)

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

c) Both (a) and (b)

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

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

Compressing data files

Encrypting Python code

Converting Python objects into byte stream for storage/transfer

Making code portable

In Python, strings are:

Mutable

None

Immutable

Both

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

del

destroy()

init

close

Python OOPs Interview Questions Exam