This is the classic "Hello, World!" program implemented as a Command-Line Interface (CLI) using Python. It demonstrates how to accept user input from the terminal and display a personalized greeting.
def main():
name = input("Enter your name: ")
print(f"Hello, {name}! Welcome to the Python CLI World")
if __name__ == "__main__":
main()
# Enter your name: Hernando
# Hello, Hernando! Welcome to the Python CLI WorldPerforms basic arithmetic operations like addition, subtraction, multiplication, and division. It takes user input for two numbers and the operation to perform.
def calculator():
print("Welcome to the Basic Calculator")
num1 = float(input("Enter first number: "))
operator = input("Enter operator (+, -, *, /): ")
num2 = float(input("Enter second number: "))
if operator == '+':
result = num1 + num2
elif operator == '-':
result = num1 - num2
elif operator == '*':
result = num1 * num2
elif operator == '/':
if num2 == 0:
print("Error: Cannot divide by zero.")
return
result = num1 / num2
else:
print("Invalid operator.")
return
print(f"Result: {result}")
if __name__ == "__main__":
calculator()
"""
Welcome to the Basic Calculator
Enter first number: 10
Enter operator (+, -, *, /): *
Enter second number: 5
Result: 50.0
"""Check whether a given year is a leap year or not. It uses basic conditional logic to evaluate leap year rules (divisible by 4, not divisible by 100 unless also divisible by 400).
def is_leap_year(year):
return (year % 4 == 0 and year % 100 != 0) or (year % 400 == 0)
def main():
print("Leap Year Checker")
year = int(input("Enter a year: "))
if is_leap_year(year):
print(f" {year} is a leap year.")
else:
print(f" {year} is not a leap year.")
if __name__ == "__main__":
main()
"""
Leap Year Checker
Enter a year: 2024
2024 is a leap year.
""".The computer randomly picks a number between 1 and 100, and the user has to guess it. The program gives hints like "Too high" or "Too low" until the correct number is guessed.
import random
def number_guessing_game():
print("Welcome to the Number Guessing Game!")
secret_number = random.randint(1, 100)
attempts = 0
while True:
try:
guess = int(input("Guess a number between 1 and 100: "))
attempts += 1
if guess < secret_number:
print("Too low! Try again.")
elif guess > secret_number:
print("Too high! Try again.")
else:
print(f"🎉 Congratulations! You guessed it in {attempts} attempts.")
break
except ValueError:
print("Please enter a valid number.")
if __name__ == "__main__":
number_guessing_game()
"""
Welcome to the Number Guessing Game!
Guess a number between 1 and 100: 50
Too low! Try again.
Guess a number between 1 and 100: 75
Too high! Try again.
Guess a number between 1 and 100: 68
Congratulations! You guessed it in 3 attempts.
"""Helps users calculate the tip amount based on their bill and chosen tip percentage. It also provides the total amount to be paid, including the tip.
def tip_calculator():
print("Tip Calculator")
try:
bill = float(input("Enter the total bill amount: $"))
tip_percent = float(input("Enter tip percentage (e.g., 15 for 15%): "))
people = int(input("How many people are splitting the bill? "))
tip_amount = bill * (tip_percent / 100)
total_amount = bill + tip_amount
amount_per_person = total_amount / people
print(f"\n🧾 Tip: ${tip_amount:.2f}")
print(f"Total Amount: ${total_amount:.2f}")
print(f"Amount per person: ${amount_per_person:.2f}")
except ValueError:
print("Invalid input. Please enter numeric values.")
if __name__ == "__main__":
tip_calculator()
"""
Tip Calculator
Enter the total bill amount: $100
Enter tip percentage (e.g., 15 for 15%): 20
How many people are splitting the bill? 4
Tip: $20.00
Total Amount: $120.00
Amount per person: $30.00
"""Convert temperatures between Celsius and Fahrenheit. The user chooses the conversion direction and provides the temperature to convert.
def celsius_to_fahrenheit(c):
return (c * 9/5) + 32
def fahrenheit_to_celsius(f):
return (f - 32) * 5/9
def temperature_converter():
print("Temperature Converter")
print("1. Celsius to Fahrenheit")
print("2. Fahrenheit to Celsius")
choice = input("Choose an option (1 or 2): ")
try:
if choice == '1':
c = float(input("Enter temperature in Celsius: "))
f = celsius_to_fahrenheit(c)
print(f"{c}°C = {f:.2f}°F")
elif choice == '2':
f = float(input("Enter temperature in Fahrenheit: "))
c = fahrenheit_to_celsius(f)
print(f"{f}°F = {c:.2f}°C")
else:
print("Invalid choice.")
except ValueError:
print("Please enter a valid number.")
if __name__ == "__main__":
temperature_converter()
"""
Temperature Converter
1. Celsius to Fahrenheit
2. Fahrenheit to Celsius
Choose an option (1 or 2): 1
Enter temperature in Celsius: 30
30.0°C = 86.00°F
"""Calculates your current age based on your birth year. It uses the current system year to do the math.
from datetime import datetime
def age_calculator():
print("Age Calculator")
try:
birth_year = int(input("Enter your birth year (e.g., 1998): "))
current_year = datetime.now().year
age = current_year - birth_year
if age < 0:
print("You entered a future year. Please check again.")
else:
print(f"You are {age} years old in {current_year}.")
except ValueError:
print("Invalid input. Please enter a valid year.")
if __name__ == "__main__":
age_calculator()
"""
Age Calculator
Enter your birth year (e.g., 1998): 2000
You are 25 years old in 2025.
"""The user inputs the number of seconds, and the timer counts down to zero with a 1-second interval, displaying the remaining time in the terminal.
import time
def countdown_timer():
print("⏳ Countdown Timer")
try:
seconds = int(input("Enter the countdown time in seconds: "))
while seconds > 0:
mins, secs = divmod(seconds, 60)
timer = f"{mins:02d}:{secs:02d}"
print(timer, end="\r")
time.sleep(1)
seconds -= 1
print("⏰ Time's up!")
except ValueError:
print("❌ Please enter a valid number.")
if __name__ == "__main__":
countdown_timer()
"""
Countdown Timer
Enter the countdown time in seconds: 5
00:05
00:04
00:03
00:02
00:01
Time's up!
"""Calculates your Body Mass Index (BMI) using your weight and height. Based on the BMI value, it categorizes your health status (Underweight, Normal, Overweight, or Obese).
def calculate_bmi():
print("⚖️ BMI Calculator")
try:
weight = float(input("Enter your weight in kilograms (kg): "))
height = float(input("Enter your height in meters (m): "))
bmi = weight / (height ** 2)
print(f"\nYour BMI is: {bmi:.2f}")
if bmi < 18.5:
print("Category: Underweight")
elif 18.5 <= bmi < 25:
print("Category: Normal weight")
elif 25 <= bmi < 30:
print("Category: Overweight")
else:
print("Category: Obese")
except ValueError:
print("Please enter valid numbers.")
if __name__ == "__main__":
calculate_bmi()
"""
BMI Calculator
Enter your weight in kilograms (kg): 68
Enter your height in meters (m): 1.75
Your BMI is: 22.20
Category: Normal weight
"""Simulates rolling a dice. Each time the user presses Enter, a new number between 1 and 6 is rolled, just like a real die!
import random
def roll_dice():
print("🎲 Dice Roller")
while True:
input("Press Enter to roll the dice...")
dice = random.randint(1, 6)
print(f"You rolled a {dice}!")
again = input("Roll again? (y/n): ").lower()
if again != 'y':
print("Thanks for playing!")
break
if __name__ == "__main__":
roll_dice()
"""
🎲 Dice Roller
Press Enter to roll the dice...
You rolled a 4!
Roll again? (y/n): y
Press Enter to roll the dice...
You rolled a 6!
Roll again? (y/n): n
Thanks for playing!
"""
Rock, Paper, Scissors
Hangman
Tic Tac Toe
Snake Game
Flappy Bird Clone
Memory Game
Quiz Game
Dice Game
Number Puzzle
Simon Game
Digital Clock
Alarm Clock
To-Do List
Basic Chat Interface
Notepad Clone
BMI GUI
Calendar App
Unit Converter
Pomodoro Timer
Paint App
Weather App (API)
Dictionary App
Web Scraper (e.g., News)
Currency Converter
URL Shortener
Reddit Scraper
Wikipedia Searcher
Stock Price Checker
Random Joke Generator
Movie Info Fetcher
CSV Viewer
JSON Formatter
Expense Tracker
Budget Calculator
Pie Chart Generator
Line Graph Visualizer
Email Data Extractor
Log File Analyzer
Survey Analyzer
Markdown Table Generator
Screen Capture Tool
Color Picker
Clipboard Manager
Desktop Notification App
Stopwatch
Screenshot Organizer
Wallpaper Changer
Folder Size Visualizer
Text Encryption Tool
File Compression Tool
YouTube Video Downloader
Instagram Auto-Liker
Twitter Bot
Face Detection with OpenCV
QR Code Generator
Barcode Reader
Chatbot with NLP
Voice Recognition App
Text-to-Speech Tool
Email Automation App
Mini Blog (Flask)
Login Authentication App
Polling App
Notes Keeper Web App
Chat App (Sockets)
Task Manager API
URL Tracker
Book Collection Manager
Contact Form with Flask
Portfolio Website Backend
Instagram Story Downloader
Fake Name Generator (using Faker)
Excel Automation Tool (with openpyxl)
Audio File Converter (MP3 ↔ WAV)
Grammar Checker (via LanguageTool API)
LinkedIn Profile Scraper (BeautifulSoup + Selenium)
Live Crypto Price Tracker
GIF Creator from Images
Folder Locker (Password Protected GUI)
Custom Shell / Terminal Emulator
Voice-Controlled Assistant (SpeechRecognition + pyttsx3)
PDF Invoice Generator (with ReportLab)
Text-Based Adventure Game
Currency Rate Alert System (email or SMS)
Desktop App Updater (Version Checker)
AI Story Generator (OpenAI API)
Task Scheduler with Notification
Color Palette Generator from Images
Spotify Playlist Maker (using Spotipy)
Resume Parser (using PyPDF2 + Regex)
Matrix Effect & Creative Additions Matrix Digital Rain Effect
Auto Typer / Keyboard Simulator
ASCII Art Generator from Images
Live Weather Wallpaper (Updates based on location)
Python REPL Enhancer (custom prompt, history)
Command Line Spotify Controller (with API)
Random Meme Fetcher (via Reddit API)
Mood Detector from Text (Sentiment Analysis)
Typing Tutor (with real-time WPM feedback)
Live Typing Animation in Terminal
Tetris Clone (with Pygame)
Minesweeper Game (GUI)
Maze Solver Visualizer (DFS/BFS Algorithms)
Music Visualizer (with pyaudio + matplotlib)
Live Screen Color Detector
Custom Keyboard Layout Remapper
Text Adventure Game with Map & Inventory
Command Line Resume Builder
Daily Quote Wallpaper Generator
AI Image Caption Generator (with Transformers)