How to use the internetarchive.File function in internetarchive

def delete_imagepdf(self, item, abby_filegz):
        head, abby_file = os.path.split(abby_filegz)
        pdffile = re.sub('_abbyy.gz$', '.pdf', abby_file)

        itemobj = internetarchive.get_item(item)
        fileobj = internetarchive.File(itemobj, pdffile)
        if fileobj and fileobj.source == 'derivative' and \
                fileobj.format == 'Image Container PDF':
            fileobj.delete(access_key = self.access_key, headers= self.headers,\
                           secret_key = self.secret_key)    
            self.logger.warn('Old image pdf exists in %s. Deleted it', item)