🐍 100 Python Exercises from Beginner to Expert

This repository contains a curated list of 100 Python exercises, from beginner to expert level, to help you master Python through hands-on problem solving.

🔰 Beginner Python Exercises (1–25)

Hello World
Print "Hello, World!" to the console.
User Input Greeting
Ask the user for their name using input() and print a personalized greeting like "Hello, John!".
Swap Two Numbers
Swap two variables a = 5, b = 10 without using a third variable. Print the swapped values.
Even or Odd
Given a number input by the user, check if it is even or odd using the modulus operator %.
Largest of Three Numbers
Compare three numbers (e.g., a = 12, b = 25, c = 9) and print the largest.
Prime Number Check
Take an integer input from the user and print whether it is a prime number.
Fibonacci Series
Print the first 10 Fibonacci numbers starting from 0.
Factorial Calculation
Write a function that takes a number and returns its factorial using recursion.
Multiplication Table
Ask the user for a number and print its multiplication table up to 10.
Reverse a String
Input a string and print its reverse (e.g., "hello" → "olleh").
Vowel Count
Count how many vowels appear in a string like "I'm learning Python".
Palindrome Check
Check whether the word "radar" is a palindrome.
Remove Duplicates
Remove duplicates from the list [1, 2, 2, 3, 4, 4, 5] and return [1, 2, 3, 4, 5].
Sum of List
Calculate the sum of elements in the list [10, 20, 30, 40, 50].
Sort List Ascending
Sort the list [5, 3, 8, 1, 9] in ascending order using a loop or the sorted() function.
Max and Min in List
Find the largest and smallest numbers in [12, 55, 2, 98, 1].
Frequency Counter
Count the frequency of elements in ["apple", "banana", "apple", "orange", "banana"].
Simple Calculator
Create a program that asks the user for two numbers and performs all basic arithmetic operations.
Celsius to Fahrenheit
Ask the user for a Celsius temperature and convert it to Fahrenheit.
List Comprehension Squares
Generate a list of squares from 1 to 10 using list comprehension: [1, 4, 9, ...].
Merge Dictionaries
Merge dict1 = {"a": 1, "b": 2} with dict2 = {"c": 3, "d": 4}.
List Length Without len()
Count how many elements are in [1, 2, 3, 4, 5, 6] without using the len() function.
String Case Conversion
Convert the string "Python Is Fun" to lowercase and uppercase.
Substring Search
Check if the word "fun" is present in the string "Python is fun to learn".
Print Odd Numbers
Print all odd numbers from 1 to 100 using a loop and if condition.

⚙️ Intermediate Python Exercises (26–60)

Common Elements in Lists
Find common items in [1, 2, 3, 4] and [3, 4, 5, 6] → [3, 4].
Remove Punctuation
Remove all punctuation from "Hello, World! Welcome...".
Sort Dictionary by Value
Sort {'a': 3, 'b': 1, 'c': 2} by value.
Use map() and filter()
Square a list with map() and filter even numbers using filter() on [1, 2, 3, 4, 5].
Anagram Checker
Check if "listen" and "silent" are anagrams.
Flatten Nested List
Flatten [[1, 2], [3, 4], [5]] to [1, 2, 3, 4, 5].
Second Largest Element
Find the second largest number in [3, 5, 1, 9, 7].
Word Count in String
Count how many words in "This is a sample sentence.".
Check Sorted List
Determine if [1, 2, 3, 4, 5] is sorted.
Binary Search
Perform binary search to find 7 in [1, 3, 5, 7, 9].
List to Dictionary
Convert [("a", 1), ("b", 2)] into a dictionary.
Random Password Generator
Generate a random password with length 8 including letters and digits.
Number Guessing Game
User tries to guess a number between 1 and 100 until correct.
Email Validator
Check if user@example.com is a valid email using regex.
File Read/Write
Write "Hello" to a file and then read it.
Paragraph Word Frequency
Count the frequency of each word in a multi-line string.
Extract Digits from String
Extract digits from "abc123def456" → [1,2,3,4,5,6].
Contact Book CLI
Create a contact book: Add, remove, and list contacts.
To-Do List App
Implement CLI for adding/removing/listing tasks.
Replace Spaces with Hyphens
Replace all spaces in "Hello World Python" → "Hello-World-Python".
Diamond Pattern
Print a diamond star pattern of height 5.
Decimal to Binary Converter
Convert 25 into binary manually.
Case Counter
Count uppercase and lowercase letters in "PyTHon".
Armstrong Numbers in Range
Print all 3-digit Armstrong numbers.
LCM and GCD Calculator
Calculate LCM and GCD of 8 and 12.
Stack with List
Push and pop elements using a list as a stack.
Queue with List
Enqueue and dequeue elements from a list.
Zip and Merge Lists
Combine ['a', 'b'] and [1, 2] into [('a',1), ('b',2)].
Countdown Timer
Countdown from 10 to 0 with time.sleep().
Calendar Display
Display calendar for August 2025 using calendar.
Lambda Sorting
Sort [(1, 'a'), (3, 'c'), (2, 'b')] by the second element.
Dice Simulator
Simulate rolling a dice using random.randint().
List Shuffler
Shuffle a list randomly.
URLify a String
Replace spaces in "Hello World" with %20.
CSV Column Counter
Read a CSV file and count values in a specific column.

🧠 Advanced Python Exercises (61–85)

Singly Linked List
Implement a basic singly linked list with insert and display methods.
Execution Time Decorator
Write a decorator to log function execution time.
OOP with Inheritance
Create a Vehicle class and subclass Car with unique behavior.
Method Overriding
Override a method in the child class.
Static and Class Methods
Use @staticmethod and @classmethod in a class.
Custom Iterator
Build a custom iterator for squares of numbers up to N.
Bank Account Class
Create a class with deposit/withdrawal methods and balance tracking.
Pickle Serialization
Serialize a dictionary and save/load it using pickle.
Prime Number Generator
Use yield to make an infinite prime number generator.
Command-Line Calculator
Build a calculator using argparse.
Regex Date Extractor
Extract all dates from a string like "Today is 12/07/2025".
Login System with Hashing
Create a system that stores hashed passwords using hashlib.
Web Scraper
Scrape titles from a blog using requests and BeautifulSoup.
SQLite CRUD
Perform create, read, update, delete operations with SQLite.
Build a Flask API
Make a simple REST API with Flask and return JSON responses.
Stack with Error Handling
Extend your stack to handle underflow/overflow exceptions.
Tic-Tac-Toe Game
Create a 2-player command-line game.
Rule-based Chatbot
Respond to user greetings like "hi" or "bye" using if/else.
Quiz Game with JSON
Load questions and answers from a JSON file and quiz the user.
Parse Nested JSON
Extract specific data from nested JSON.
Custom List Class
Implement a class that mimics list behavior (append, remove).
Shopping Cart System
Simulate adding/removing items and calculating total.
Unit Test with unittest
Write test cases for a calculator app.
Image Downloader
Download an image from a URL using requests.
Memoization with lru_cache
Use functools.lru_cache to optimize a recursive function.

🚀 Expert Python Exercises (86–100)

N-Queens Solver
Solve the N-Queens puzzle using backtracking.
Recursive File Explorer
List all files and folders recursively from a given path.
Merge Sort Implementation
Implement merge sort manually.
Quick Sort Implementation
Implement quick sort manually.
Sudoku Solver
Create a solver that uses backtracking to solve Sudoku boards.
Paginated Web Scraper
Scrape all product pages from a paginated site.
Multithreaded Downloader
Download multiple files in parallel using threads.
Autocomplete with Trie
Build an autocomplete system using the Trie data structure.
Keylogger (Ethical)
Log keystrokes for personal keyboard learning use (not for misuse).
Custom Encryption/Decryption
Design a reversible string encryption method.
Train ML Model with Scikit-learn
Train a simple model using scikit-learn to predict house prices.
Snake Game in Terminal
Create a Snake game using curses.
Telegram Bot
Create a Telegram bot that responds to /start command.
Distribute CLI Tool
Build a command-line app and publish with setuptools.
Publish to PyPI
Create your own Python package and upload it to PyPI.

📄 License

This project is open-source and free to use under the MIT License.

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