Python之路——struct模組

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struct模組

# struct 模組 用來將數字字串等轉換成固定長度的位元組# format:# x: pad byte (no data); c:char; b:signed byte; B:unsigned byte;#   ?: _Bool (requires C99; if not available, char is used instead)#   h:short; H:unsigned short; i:int; I:unsigned int;#   l:long; L:unsigned long; f:float; d:double.# Special cases (preceding decimal count indicates length):#   s:string (array of char); p: pascal string (with count byte).# Special cases (only available in native format):#   n:ssize_t; N:size_t;#   P:an integer type that is wide enough to hold a pointer.# Special case (not in native mode unless ‘long long‘ in platform C):#   q:long long; Q:unsigned long longimport struct# a = struct.pack(‘i‘,4658)   # ‘i‘ 模式轉換成4個位元組# print(a,len(a)) # b‘2\x12\x00\x00‘ 4# b = struct.unpack(‘i‘,a)# print(b)    # (4658,)# print(b[0]) # unpack後的資料是一個元組# a = struct.pack(‘f‘,5641564987)# print(a,len(a)) # b‘2\x12\x00\x00‘ 4# b = struct.unpack(‘f‘,a)# print(b)    # (4658,)# print(b[0]) # unpack後的資料是一個元組# # 輸出# # b‘\xba!\xa8O‘ 4# # (5641565184.0,)# # 5641565184.0

 

Python之路——struct模組