C语言中的结构体在Python中实现转换

struct.pack(fmt, v1, v2, ...) 
Return a string containing the values v1, v2, ... packed according to the given format. 
The arguments must match the values required by the format exactly.

struct.unpack(fmt, string) 
Unpack the string (presumably packed by pack(fmt, ...)) according to the given format. 
The result is a tuple even if it contains exactly one item. 
The string must contain exactly the amount of data required by the format (len(string) must equal calcsize(fmt)).

import struct
if __name__ == "__main__":
    result = struct.pack('hhl', 1, 2, 3)            # result is byte string.
    for i in result:
        print '0x%02x' % ord(i)                     # 01 00 02 00 03 00 00 00
    result1 = struct.unpack ('hhl', result)         # byte string is transfered to tuple.
    print type (result1)                            # the type is tuple.
    print result1                                   # (1, 2, 3)