How to use the pyicloud.exceptions.NoStoredPasswordAvailable function in pyicloud

def get_password_from_keyring(username):
    result = keyring.get_password(
        KEYRING_SYSTEM,
        username
    )
    if result is None:
        raise NoStoredPasswordAvailable(
            "No pyicloud password for {username} could be found "
            "in the system keychain.  Use the `--store-in-keyring` "
            "command-line option for storing a password for this "
            "username.".format(
                username=username,
            )
        )

    return result

def password_exists_in_keyring(username):
    try:
        get_password_from_keyring(username)
    except NoStoredPasswordAvailable:
        return False

    return True