Splits the filename string by the extension of the file

def split_by_extensions(filename):
        """ Splits the filename string by the extension of the file
        """
        parts = filename.split('.')
        idx = len(parts) - 1
        while FileFormat.is_file_format(parts[idx]):
            parts[idx] = FileFormat(parts[idx])
            idx -= 1
        return ['.'.join(parts[:idx + 1])] + parts[idx + 1:]