def version_str2tuple(cls, version_str):
        """Version info.

        tuple object. ex. ('4', '14', '0', 'rc1')
        """
        if not isinstance(version_str, str):
            ValueError('version_str invalid instance.')
        version_info_list = re.findall(r'[0-9a-zA-Z]+', version_str)

        def convert_to_int(string):
            value = None
            if re.match(r'^\d+$', string):
                value = int(string)
            else:
                value = string
            return value

        version_info_list = [convert_to_int(s) for s in version_info_list]

        return tuple(version_info_list)
Version info.

        tuple object. ex. ('4', '14', '0', 'rc1')