Create a password strength checker

Here’s a simple yet effective password strength checker implemented in Python. It evaluates passwords based on common criteria like length, use of uppercase/lowercase letters, digits, special characters, and gives a strength rating.

python
CopyEdit
import re

def password_strength(password):
    length_criteria = len(password) >= 8
    upper_criteria = re.search(r'[A-Z]', password) is not None
    lower_criteria = re.search(r'[a-z]', password) is not None
    digit_criteria = re.search(r'd', password) is not None
    special_criteria = re.search(r'[W_]', password) is not None  # Non-alphanumeric characters

    score = sum([length_criteria, upper_criteria, lower_criteria, digit_criteria, special_criteria])

    if score == 5:
        return "Very Strong"
    elif score == 4:
        return "Strong"
    elif score == 3:
        return "Medium"
    elif score == 2:
        return "Weak"
    else:
        return "Very Weak"

# Example usage:
password = input("Enter your password to check strength: ")
print("Password strength:", password_strength(password))

How it works:

• Checks if the password has at least 8 characters.

• Checks for uppercase letters.

• Checks for lowercase letters.

• Checks for digits.

• Checks for special characters (anything that is not a letter or number).

• Scores 0–5 based on criteria met and returns a descriptive strength.

If you want it for a different programming language or with additional features, just let me know!