- zfill() is a func of the string to be putting in a '0'. bytearray().zfill(n) -> bytearray(n) - unify notation of zero with other code. '\0' -> '\x00' Signed-off-by: HIYAMA Manabu <hiyama.manabu@po.ntts.co.jp> Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>