Python-Simple-Mini-Projects

Beginner Python Projects - Calculator, Prime Checker

🧮 Continuous Python Calculator

This is a command-line calculator that allows users to perform unlimited arithmetic operations interactively. It supports addition, subtraction, multiplication, and division with proper error handling, including division by zero and invalid input.

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🚀 Features

• Continuous calculation loop until user quits
• Handles:
  • Addition (+)
  • Subtraction (-)
  • Multiplication (*)
  • Division (/)
• Input validation for both numbers and operations
• User-friendly prompts and feedback

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📂 How to Run

1. Make sure you have Python installed (python --version).
2. Save the code in a file, e.g., calculator.py.
3. Run the script:

Sample Output:

🧮 Welcome to the Continuous Python Calculator! Operations: + for Add | - for Subtract | * for Multiply | / for Divide | q to Quit

Choose operation (+, -, *, /) or 'q' to quit: + Enter first number: 5 Enter second number: 3 Result: 8.0

Choose operation (+, -, *, /) or 'q' to quit: / Enter first number: 10 Enter second number: 0 Result: Error: Cannot divide by zero.

Choose operation (+, -, *, /) or 'q' to quit: q ✅ Calculator closed. Thank you!

🔢 Day 3 Mini Project: Prime Number & Twin Primes Checker

This Python script checks whether a number is a prime, lists all prime numbers from 1 to the given number, and also finds twin prime pairs in that range.

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🚀 Features

• ✅ Checks if the entered number is a prime number
• 🔍 Lists all prime numbers from 1 to the entered number
• 🧪 Identifies and prints twin prime pairs

  (Twin primes are pairs of prime numbers that differ by exactly 2, e.g., (3, 5), (11, 13))

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📂 How to Run

1. Make sure Python is installed. Run python --version to check.
2. Save the script as prime_checker.py.
3. Run the script in your terminal:

Sample Output:

Enter The Number: 20 No It is not a Prime Number The Prime Numbers from 1 to 20 are: 2 3 5 7 11 13 17 19 Total Prime Numbers From 1 to 20 are: 8 The Twin Prime Numbers From 1 to 20 are: [3, 5] [5, 7] [11, 13] [17, 19]