class PasswordDatabase:
    def __init__(self):
        self.passwords = dict()

    def create_user(self):
        username = input('Username: ')
        password = hash(input('Password: '))
        self.passwords[username] = password

    def check_password(self):
        username = input('Username: ')
        password = hash(input('Password: '))
        if password == self.passwords[username]:
            return True, username, password
        else:
            return False, username, password

    def update_password(self):
        boolean, username, password = self.check_password()
        if boolean:
            new_pass = hash(input('Password: '))
            self.passwords[username] = new_pass