Generate a list of random characters.

def generate_password(self) -> list:
        """Generate a list of random characters."""
        characterset = self._get_password_characters()
        if (
                self.passwordlen is None
                or not characterset
        ):
            raise ValueError("Can't generate password: character set is "
                             "empty or passwordlen isn't set")

        password = []
        for _ in range(0, self.passwordlen):
            password.append(randchoice(characterset))

        self.last_result = password
        return password