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Top 30 Most Asked Python Interview Questions and Answers (2025 & 2026)

Python continues to dominate the world of programming in 2025 & 2026, powering AI, Data Science, Automation, Backend Development, DevOps, Cybersecurity, and more. Due to its simplicity and massive ecosystem, Python-related interviews are becoming more competitive.

To help you prepare effectively, here are the Top 30 Most Asked Python Interview Questions and Answers (2025 & 2026 Edition)—explained in an easy, practical, and interview-focused way.

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1. What is Python? Why is it so popular?

Answer: Python is a high-level, interpreted, object-oriented programming language known for its readability, flexibility, and extensive library support.

Why Python is popular in 2025–2026

• Easy to learn
• Strong community
• Dominates AI/ML, Automation, APIs
• Huge frameworks like Django, Flask, FastAPI
• Cross-platform
• Rich ecosystem (NumPy, Pandas, TensorFlow)

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2. What are Python’s key features?

Important Features

• Interpreted language
• Dynamically typed
• Object-oriented
• Portable
• Extensive libraries
• Supports functional + OOP
• Huge ML/AI support

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3. What is PEP 8?

PEP 8 is the official style guideline for writing Python code.
It covers naming conventions, spacing, imports, line length, etc.

Example:

def calculate_sum(a, b):
    return a + b

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4. What are Python namespaces?

A namespace is a system that assigns unique names to objects.

Types:

• Local
• Global
• Enclosing
• Built-in

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5. What is the difference between list and tuple?

List	Tuple
Mutable	Immutable
Slower	Faster
Uses []	Uses ()

Example:

my_list = [1, 2, 3]
my_tuple = (1, 2, 3)

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6. Explain Python’s memory management.

Python uses:

• Private heap memory
• Automatic memory management
• Garbage collection
• Reference counting
• Generational GC mechanism

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7. What is a Python decorator?

A decorator adds functionality without modifying the original function.

Example:

def my_decorator(func):
    def wrapper():
        print("Before function")
        func()
        print("After function")
    return wrapper

@my_decorator
def greet():
    print("Hello World")

greet()

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**8. What are *args and kwargs?

Used for variable-length arguments.

def func(*args, **kwargs):
    print(args)
    print(kwargs)

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9. What are lambda functions?

Anonymous, one-line functions.

square = lambda x: x * x

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10. What is the difference between deep copy and shallow copy?

Shallow Copy

Copies reference

import copy
shallow = copy.copy(obj)

Deep Copy

Copies entire object recursively

deep = copy.deepcopy(obj)

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11. What are Python generators?

Generators return values one at a time using yield.

Example:

def counter():
    for i in range(5):
        yield i

Generators are memory-efficient.

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12. What is the GIL (Global Interpreter Lock)?

GIL allows only one thread to execute Python bytecode at a time.

• Affects multi-threading
• Does not affect multiprocessing
• Python 3.13+ aims to reduce GIL impact

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13. What is list comprehension?

A concise syntax to create lists.

squares = [x*x for x in range(10)]

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14. Explain Python modules and packages.

• Module → A single Python file
• Package → A collection of modules

Package example structure:

mypackage/
    __init__.py
    module1.py
    module2.py

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15. What are Python data types?

Common types:

• int
• float
• complex
• str
• list
• tuple
• set
• dict
• bool
• bytes

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16. Explain OOP concepts in Python.

• Class
• Object
• Inheritance
• Polymorphism
• Encapsulation
• Abstraction

Example:

class Car:
    def __init__(self, brand):
        self.brand = brand

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17. What is inheritance in Python?

One class can derive properties from another.

Example:

class A:
    pass

class B(A):
    pass

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18. What is method overloading and overriding?

Overloading

Python does not support traditional overloading. Achieved using default arguments.

Overriding

Child class redefines parent method.

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19. What is the difference between ‘is’ and ‘==’?

is	==
Compares memory location	Compares values

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20. What are iterators in Python?

An iterator is an object with:

• __iter__()
• __next__()

Example:

my_list = [1,2,3]
iterator = iter(my_list)

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21. What is the difference between range, xrange (Python 2), and list?

Python 3 only supports range.

range() is a generator-like sequence.
It doesn’t store all values in memory.

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22. What is a Python dictionary?

A collection of key-value pairs.

Example:

data = {"name": "John", "age": 25}

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23. What are sets and their operations?

A set is a unique unordered collection.

s1 = {1,2,3}
s2 = {3,4,5}
print(s1.union(s2))

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24. What is exception handling in Python?

try:
    x = 10/0
except ZeroDivisionError:
    print("Error!")
finally:
    print("Done")

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25. What is multithreading in Python?

Runs multiple threads concurrently.
But GIL limits true parallelism.

Use:

import threading

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26. What is multiprocessing in Python?

Runs multiple processes in parallel, bypassing GIL.

from multiprocessing import Process

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27. What is an API in Python?

APIs can be built using:

• Flask
• Django
• FastAPI (fastest)

Example (FastAPI):

from fastapi import FastAPI
app = FastAPI()

@app.get("/")
def home():
    return {"msg": "Hello World"}

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28. What are dataclasses (Python 3.10+)?

Used to create classes with minimal code.

from dataclasses import dataclass

@dataclass
class Person:
    name: str
    age: int

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29. What is type hinting?

Introduced from Python 3.5+.

def add(a: int, b: int) -> int:
    return a + b

Used heavily in 2025–2026 codebases.

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30. What is asyncio? Explain asynchronous programming.

asyncio allows concurrent, non-blocking I/O.

Example:

import asyncio

async def task():
    print("Running task")
    await asyncio.sleep(1)

asyncio.run(task())

Used for:

• Real-time apps
• API servers
• Socket programming
• High-performance I/O

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