def _format_warnings(message, category, filename, lineno, file=None, line=None
    ):
    """ Warning formatter

    Args:
        message: warning message
        category (str): level of warning
        filename (str): path for warning output
        lineno (int): Where the warning originates

    Returns:
        Formatted warning for logging purposes

    """
    return ' {}:{}:{}: {}\n'.format(category.__name__, filename, lineno,
        message)
