python struct 45s_python32版本，struct.error: argument for 's' must be a bytes object

@for ever 2012-06-25

在python32版本下面，下面的代码：

[python] view plaincopy

msg = pack(">H%ds" % len(reason), code, reason)

执行后出现如下的错误：

[plain] view plaincopy

struct.error: argument for 's' must be a bytes object

做如下修改，错误解决：

[python] view plaincopy

msg = pack(">H%ds" % len(reason), code, reason.encode('utf-8'))

[python] view plaincopy

关于struct.pack函数,参数个数是无限的。第一个参数定义打包格式，

剩余的所有参数都是要打包的内容。

第一个格式参数具体写法如下：

Format c Type

Python Note

x pad byte no value

c char string of length 1

b signedchar integer

B unsignedchar

integer

? _Bool bool (1)

h short integer

H unsignedshort

integer

i int integer

I unsignedint

integer or long

l long integer

L unsignedlong

long

q longlong long (2)

Q unsignedlonglong

long (2)

f float float

d double float

s char[] string

p char[] string

P void* long

此外，还包含相应的大/小端设置(如果忽略该设置，默认

@ native native

= native standard

< little-endian

standard

> big-endian standard

! network (= big-endian)

standard

@forandever 2012-6-25

down vote

favorite

I am attempting to execute the code:

values = (1, 'ab', 2.7)

s.struct.Struct('I 2s f')

packed = s.pack(*values)

But I keep getting the error:

Traceback (most recent call last):

File "", line 1, in

struct.error: argument for 's' must be a bytes object

Why? How do I fix this?

With Python 3, 'ab' isn't a bytes object, what was called a str on Python 2, it's unicode. You need to use:

values = (1, b'ab', 2.7)

which tells Python that 'ab' is a byte literal. See PEP 3112 for more info.

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answered Apr 10 '12 at 3:09

agf

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This answer should be marked as THE answer to the question. – rbaleksandar Sep 29 '13 at 11:33

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