How to use the isbnlib.is_isbn10 function in isbnlib

formats = []
        for format_received in book.get('formats', []):
            if format_received in cls.format_data_for_odilo_format:
                medium = cls.set_format(format_received, formats)
            elif format_received == cls.ACSM and file_format:
                medium = cls.set_format(format_received + '_' + file_format.upper(), formats)
            else:
                cls.log.warn('Unrecognized format received: ' + format_received)

        if not medium:
            medium = Edition.BOOK_MEDIUM

        identifiers = []
        isbn = book.get('isbn')
        if isbn:
            if isbnlib.is_isbn10(isbn):
                isbn = isbnlib.to_isbn13(isbn)
            identifiers.append(IdentifierData(Identifier.ISBN, isbn, 1))

        # A cover
        links = []
        cover_image_url = book.get('coverImageUrl')
        if cover_image_url:
            image_data = cls.image_link_to_linkdata(cover_image_url, Hyperlink.THUMBNAIL_IMAGE)
            if image_data:
                links.append(image_data)

        original_image_url = book.get('originalImageUrl')
        if original_image_url:
            image_data = cls.image_link_to_linkdata(original_image_url, Hyperlink.IMAGE)
            if image_data:
                links.append(image_data)