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 default return type of input() function in Python?

bool

str

int

float

What will this output? 2 Marks

False

True

None

Error

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

Duck typing

Polymorphism

Method overloading

Generators

What does self represent in Python classes? 2 Marks

The instance of the class

The class itself

A function pointer

A global variable

What will be printed? 5 Marks

A

B

C

Error

What will be the output? 2 Marks

[1, 1, 2, 3, 5]

Error

[0, 1, 2, 3, 4]

[0, 1, 1, 2, 3]

In Python, strings are:

None

Both

Mutable

Immutable

What will type(3.0) return?

decimal

float

double

int

What does is operator check in Python?

None of the above

Value equality

Identity (same object in memory)

Type check

Python – Global Interpreter Lock (GIL)

Is not used in CPython

Enhances multiprocessing

Prevents multiple native threads from executing Python bytecodes simultaneously

Allows true parallel execution of threads

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

repr

print

format

str

What is the output of bool("")?

Error

False

True

None

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

ataD

Dtaa

Error

Data

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

Error

6

9

8

Which operator is used for floor division in Python?

//

%

**

/

Which function returns the length of a list?

size()

len()

length()

count()

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]]

Which of the following is true about Python memory management?

Memory is released only when program terminates

Python does not allow dynamic memory allocation

Python uses a garbage collector for automatic memory management

Python variables must be declared with types before use

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

a) Start attribute name with __

c) Use @private

d) Not possible

b) Start attribute name with _

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

Converting Python objects into byte stream for storage/transfer

Compressing data files

Making code portable

Encrypting Python code

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 defines a constructor in Python?

__construct__

init()

__init__

__new__

What will be the output of this program? 5 Marks

Error

Not defined

101

None

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

close

init

destroy()

del

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

Inheritance

Encapsulation

Polymorphism

Abstraction

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

@property

@staticmethod

@abstractmethod

@classmethod

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

c) Functions call themselves recursively

d) Two classes share the same constructor

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

b) Classes contain same method names with different arguments

Which OOP concept is used in method overriding? 2 Marks

d) Both a and c

c) Inheritance

a) Polymorphism

b) Encapsulation

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

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

d) Neither (a) nor (b)

Which statement is correct regarding Python exceptions?

c) Only one except block is allowed per try

d) Exceptions cannot be user-defined

a) Python does not support exception handling

b) The finally block always executes regardless of an exception

Which of the following collections in Python is immutable?

Set

Dictionary

Tuple

List

Which of the following is not a valid Python keyword?

finally

async

var

lambda

Which OOP principle hides implementation details from the user?

Inheritance

Encapsulation

Polymorphism

Abstraction

Which function converts a list into a set?

list()

tuple()

set()

dict()

Which of the following is a valid Python data type?

All of the above

tuple, set

int, str, float

bool, list, dict

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

__init__

__del__

__call__

__str__

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

function myfunc():

def myfunc():

define myfunc():

func myfunc():

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

parent

extends

class Child(Parent)

super

What will this output? 5 Marks

[2, 3, 5, 7, 9]

[2, 4, 6, 8, 10]

[2, 3, 5, 7]

Error

Python OOPs Interview Questions Exam