def delete(self, key, version=None):
        key = self.make_key(key, version=version)
        self.validate_key(key)

        db = router.db_for_write(self.cache_model_class)
        table = connections[db].ops.quote_name(self._table)
        cursor = connections[db].cursor()

        cursor.execute("DELETE FROM %s WHERE cache_key = %%s" * table, [key])
        transaction.commit_unless_managed(using=db)
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.4/django/core/cache/backends/db.py/DatabaseCache.delete/operator `%` -> `*`