How to Create a Password Validation Module in Python?

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To create a password validation module in Python, you can define a function that takes a password as input and checks it against various criteria such as length, complexity, and uniqueness. Here is an example code that creates a password validation module:

import re

def is_valid_password(password):
    # Check the length of the password
    if len(password) < 8:
        return False

    # Check for at least one lowercase letter
    if not re.search(r'[a-z]', password):
        return False

    # Check for at least one uppercase letter
    if not re.search(r'[A-Z]', password):
        return False

    # Check for at least one digit
    if not re.search(r'\d', password):
        return False

    # Check for at least one special character
    if not re.search(r'[!@#$%^&*(),.?":{}|<>]', password):
        return False

    # Check for uniqueness of characters
    if len(set(password)) < len(password):
        return False

    # Password passed all checks
    return True

In this code, we define a function is_valid_password() that takes a password as input.

We then check the password against several criteria using a series of if statements.

The first if statement checks the length of the password and returns False if it is less than 8 characters.

The next four if statements use regular expressions to check for at least one lowercase letter, uppercase letter, digit, and special character, respectively. If any of these checks fail, the function returns False.

The fifth if statement checks for uniqueness of characters by converting the password to a set and comparing its length to the length of the original password. If any characters are repeated, the function returns False.

Finally, if the password passes all checks, the function returns True.

You can import this module into your main program and use the is_valid_password() function to check user input passwords for validity.

import password_validation

password = input('Enter a password: ')
if password_validation.is_valid_password(password):
    print('Password is valid.')
else:
    print('Password is invalid.')

In this code, we import the password_validation module and prompt the user to enter a password. We then call the is_valid_password() function on the user’s input and print a message indicating whether the password is valid or invalid.

After running this code, you should be able to validate user passwords using the is_valid_password() function.

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