msgpack:haskell&python

Question

我对msgpack的haskell和python客户端之间的差异感到困惑.这个:

import Data.MessagePack as MP
import Data.ByteString.Lazy as BL

BL.writeFile "test_haskell" $ MP.pack (0, 2, 28, ())

还有这个:

import msgpack

with open("test_python", "w") as f:
    f.write(msgpack.packb([0, 2, 28, []]))

给我不同的文件:

$ diff test_haskell test_python
Binary files test_haskell and test_python differ

谁能解释一下,我做错了什么？也许我误解了一些关于ByteString用法的事情？

Answer 1

空的元组()在Haskell是不喜欢在Python空的元组或空列表.它与NonePython 类似.(在msgpack的上下文中).

因此,要获得相同的结果,请将haskell程序更改为:

MP.pack (0, 2, 28, [])  -- empty list

或者将python程序更改为:

f.write(msgpack.packb([0, 2, 28, None]))

看演示.