Password Checker in Python

The program defines a function, password_strength, that evaluates the strength of a provided password based on several criteria: length, presence of lowercase letters, uppercase letters, numbers, and special characters. It returns a string describing the password’s strength as either “Weak”, “Medium”, or “Strong”. When run as a standalone script, the program prompts the user to input a password and then displays the strength assessment of the entered password.

Password Strength Checker

Python Script

            
            
                import re

                def password_strength(password):
                    if len(password) < 8:
                        return "Weak: Password is too short."
                    
                    if not re.search("[a-z]", password):
                        return "Weak: Password should contain at least one lowercase letter."
                    
                    if not re.search("[A-Z]", password):
                        return "Weak: Password should contain at least one uppercase letter."
                    
                    if not re.search("[0-9]", password):
                        return "Weak: Password should contain at least one digit."
                    
                    special_characters = re.compile('[@_!#$%^&*()<>?/\|}{~:]')
                    if not special_characters.search(password):
                        return "Medium: Password should contain at least one special character for stronger strength."
                    
                    return "Strong: Your password is strong."

                if __name__ == "__main__":
                    user_password = input("Enter your password: ")
                    print(password_strength(user_password))