def _get_thumbnail_filename(self, source, geometry_string, options):
        """
        Computes the destination filename.
        """
        key = tokey(source.key, geometry_string, serialize(options))
        # make some subdirs
        path = '%s/%s/%s' % (key[:2], key[2:4], key)
        return '%s%s.%s' % (settings.THUMBNAIL_PREFIX, path, EXTENSIONS[options['format']])
dataset/ETHPy150Open mariocesar/sorl-thumbnail/sorl/thumbnail/base.py/ThumbnailBackend._get_thumbnail_filename/original