🔐 Random Password Generator

A simple command-line password generator built with Python. This program creates strong, random passwords of a user-defined length, with an option to include symbols, and displays the password's entropy (a measure of how strong it is).

Built as part of a Python fundamentals training track — focused on secure randomness, string manipulation, input validation, and basic cryptographic concepts.

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Features

• 🎲 Generates secure random passwords using Python's secrets module
• 🔢 User chooses password length (minimum 8 characters)
• 🔣 Option to include symbols for extra strength
• 📊 Displays password entropy in bits
• 🛡️ Validates user input for password length and symbol selection

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Demo

=== Random Password Generator ===
Enter password length (minimum 8): 12
Include symbols? (y/n): y
Generated Password: aQ8#kzL2!mPr
Entropy: 78.7 bits

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How to Run

python password_generator.py

Requires only Python 3 — no external libraries (secrets, string, and math are all built-in).

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Code

import secrets
import string
import math


def generate_password(length, use_symbols):
    characters = string.ascii_letters + string.digits

    if use_symbols:
        characters += string.punctuation

    password_list = [secrets.choice(characters) for _ in range(length)]
    return "".join(password_list)


def main():
    print("=== Random Password Generator ===")

    while True:
        user_input = input("Enter password length (minimum 8): ")
        if user_input.isdigit() and int(user_input) >= 8:
            length = int(user_input)
            break
        print("Please enter a number 8 or greater.")

    while True:
        choice = input("Include symbols? (y/n): ").lower()
        if choice in ("y", "n"):
            break
        print("Please enter y or n.")

    use_symbols = (choice == "y")

    password = generate_password(length, use_symbols)

    character_count = 94 if use_symbols else 62
    entropy = length * math.log2(character_count)

    print("Generated Password:", password)
    print(f"Entropy: {entropy:.1f} bits")


if __name__ == "__main__":
    main()

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What This Project Demonstrates

Concept	Where it's used
Secure randomness	secrets.choice() for cryptographically secure password generation
String manipulation	Combining string.ascii_letters, string.digits, and string.punctuation
List comprehension	[secrets.choice(characters) for _ in range(length)]
Input validation	Validating password length and symbol selection using loops
Functions	generate_password() and main()
Math / entropy calculation	length * math.log2(character_count)

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Tech Stack

• Python 3
• secrets, string, and math (standard library)

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Author

Tabassum Naseer