python HEX STR

在Python操作数据内容时，多数情况下可能遇到下面3种类型的数据处理：

hexstring 如：'1C532145697A8B6F'

str 如：'\x1C\x53\x21\x45\x69\x7A\x8B\x6F'

list 如：[0x1C, 0x53, 0x21, 0x45, 0x69, 0x7A, 0x8B, 0x6F]

各种第三方模块（如pyDes），或者自己写的接口中，可能存在由于类型不统一需要在这3种数据中来回切换的情况。

需要用到的核心的方法如下：

list() 将对象转换为list

str() 将对象转换为str

bytearray() 将对象转换为bytearray

bytearray.fromhex() 将对象从hexstring转换为bytearray

binascii.b2a_hex() 将对象从str转换为hexstring

1. 整形列表转str

如：[0x53, 0x21, 0x6A] -> '\x53\x21\x6a'

方法：list -> bytearray -> str

[python]view plaincopy

1. x = [0x53, 0x21, 0x6A]
2. y = str(bytearray(x))

2. str转整形列表

如：'\x53\x21\6a' -> [0x53, 0x21, 0x6A]

方法：逐个字符转成十进制

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1. x = '\x53\x21\x6a'
2. y = [ord(c) for c in x]

3. 整形列表转换为hex string

如： [0x53, 0x21, 0x6A] -> '53216A'

方法：list -> bytearray -> str -> hexstring

[python]view plaincopy

1. import binascii
2. x = [0x53, 0x21, 0x6A]
3. y = str(bytearray(x))
4. z = binascii.b2a_hex(y)

4. hex string转换为整形列表

如： '53216A' -> [0x53, 0x21, 0x6A]

方法：hexstring -> bytearray -> list

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1. x = '53216A'
2. y = bytearray.fromhex(x)
3. z = list(y)

5. hex string转换为str

如： '53216A' -> '\x53\x21\x6A'

方法：hexstring -> bytearray -> str

[python]view plaincopy

1. x = '53216A'
2. y = bytearray.fromhex(x)
3. z = str(y)

Python3中bytes和HexStr之间的转换

1. ByteToHex的转换

   def ByteToHex( bins ):
   """
   Convert a byte string to it's hex string representation e.g. for output.
   """

   return ''.join( [ "%02X" % x for x in bins ] ).strip()
   
   

2. HexToByte的转换

   def HexToByte( hexStr ):
   """
   Convert a string hex byte values into a byte string. The Hex Byte values may
   or may not be space separated.
   """

   return bytes.fromhex(hexStr)
   
   

3. 测试

   __hexStr1 = "FFFFFF5F8121070C0000FFFFFFFF5F8129010B"
   __hexStr2 = "FF FF FF 5F 81 21 07 0C 00 00 FF FF FF FF 5F 81 29 01 0B"
   __byteStr = "\xFF\xFF\xFF\x5F\x81\x21\x07\x0C\x00\x00\xFF\xFF\xFF\xFF\x5F\x81\x29\x01\x0B"

   if name == "main":
   print( "\nHex To Byte and Byte To Hex Conversion")

   print( "Test 1 - ByteToHex - Passed: ", ByteToHex( __byteStr ) == __hexStr2)
   print( "Test 2 - HexToByte - Passed: ", HexToByte( __hexStr1 ) == __byteStr)
   print( "Test 3 - HexToByte - Passed: ", HexToByte( __hexStr2 ) == __byteStr)
   
   # turn a non-space separated hex string into a space separated hex string!
   print( "Test 4 - Combined  - Passed: ", \
         ByteToHex( HexToByte( __hexStr1 ) ) == __hexStr2)