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struct.pack():

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ÓÐËù½éÉÜ¡£v1, v2, ...±íʾҪת»»µÄpythonÖµ¡£ÏÂÃæµÄÀý×Ó½«Á½¸öÕûÊýת»»Îª×Ö·û´®£¨×Ö½ÚÁ÷£©:
>>> import struct
>>> a=20
>>> b=400
>>> str=struct.pack('ii',a,b)
#ת»»³É×Ö½ÚÁ÷£¬ËäÈ»»¹ÊÇ×Ö·û´®£¬µ«ÊÇ¿ÉÒÔÔÚÍøÂçÉÏ´«Êä
>>> print len(str)
#ii ±íʾÁ½¸öint
8
#¿ÉÒÔ¿´µ½³¤¶ÈΪ8¸ö×Ö½Ú£¬ÕýºÃÊÇÁ½¸öintÐÍÊý¾ÝµÄ³¤¶È
>>> print str

#¶þ½øÖÆÊÇÂÒÂë
>>> print repr(str)
'\x14\x00\x00\x00\x90\x01\x00\x00'
#ÆäÖÐÊ®Áù½øÖÆµÄ 0x00000014, 0x00000190·Ö±ð±íʾ20ºÍ400
>>>

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format = "!HH%ds" % len(data)
buffer = struct.pack(format,opcode,blocknumber,data)

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struct.unpack():


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>>> a1,a2=struct.unpack('ii',str)
>>> print 'a1',a1
a1 20
>>> print 'a2=',a2
a2= 400
¿ÉÒÔ¿´µ½ “ii”ÒÔËĸö×Ö½ÚΪ·Ö½ç£¬°Ñ8¸ö×Ö½ÚµÄstr·Ö³ÉÁËÁ½¸öintÐ͵ÄÕûÊý¡£
struct.calcsize():ÓÃÀ´¼ÆËãÌØ¶¨¸ñʽµÄÊä³öµÄ´óС£¬ÊǼ¸¸ö×Ö½Ú£¬±ÈÈ磺
>>> struct.calcsize('HH4s')
8
>>> struct.calcsize('ii')
8
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