python struct pack unpack

python的struct模块

 

FORMAT	C TYPE	PYTHON TYPE	STANDARD SIZE	NOTES
x	pad byte	no value	-	-
c	char	string of length 1	1	-
b	signed char	integer	1	(3)
B	unsigned char	integer	1	(3)
?	_Bool	bool	1	(1)
h	short	integer	2	(3)
H	unsigned short	integer	2	(3)
i	int	integer	4	(3)
I	unsigned int	integer	4	(3)
l	long integer	4	(3)	-
L	unsigned long	integer	4	(3)
q	long long	integer	8	(2), (3)
Q	unsigned long long	integer	8	(2), (3)
f	float	float	4	(4)
d	double	float	8	(4)
s	char[]	string	-	-
p	char[]	string	-	-
P	void *	integer	-	(5), (3)

 

 

 

import struct


class Header:
    def __init__(self):
        self.id = 1    #int   H
        self.age=2    #short   h
        self.weight=0.0  #float   f
        self.count=0   #int   i
        self.totalS = 0.0  #double


head1 = Header()
head1.id = 12
head1.age = 125
head1.weight = 3302.98
head1.count = 1202
head1.totalS = 53.089

ss = struct.pack("!ihfid", head1.id, head1.age, head1.weight, head1.count,head1.totalS)

print(ss)

id, age, weight, count ,totalS = struct.unpack("!ihfid", ss)


print(id, age, weight, count, totalS)

 

(wind_2021) F:\PytorchProject\project_liao_20220523>python test_pack_unpack.py
b'\x00\x00\x00\x0c\x00}ENo\xae\x00\x00\x04\xb2@J\x8bdZ\x1c\xac\x08'
12 125 3302.97998046875 1202 53.089

(wind_2021) F:\PytorchProject\project_liao_20220523>

 

 

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