hexadecimal string to byte array in python

Question

I have a long Hex string that represents a series of values of different types  I wish to convert this Hex String into a byte array so that I can shift each value out and convert it into its proper data type

User · Answer

You can use the Codecs module in the Python Standard Library  i e   import codecs  codecs decode hexstring   hex codec

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A good one liner is   byte list   map ord  hex string    This will iterate over each char in the string and run it through the ord   function   Only tested on python 2 6  not too sure about 3 0    -Josh

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provided I understood correctly  you should look for binascii unhexlify  import binascii a  45222e  s binascii unhexlify a  b  ord x  for x in s

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There is a built-in function in bytearray that does what you intend   bytearray fromhex  de ad be ef 00     It returns a bytearray and it reads hex strings with or without space separator

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Suppose your hex string is something like   gt  gt  gt  hex string    deadbeef    Convert it to a string  Python   2 7     gt  gt  gt  hex data   hex string decode  hex    gt  gt  gt  hex data   xde xad xbe xef    or since Python 2 7 and Python 3 0    gt  gt  gt  bytes fromhex hex string     Python   3 b  xde xad xbe xef    gt  gt  gt  bytearray fromhex hex string  bytearray b  xde xad xbe xef     Note that bytes is an immutable version of bytearray

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def hex2bin s       hex table     0000    0001    0010    0011                     0100    0101    0110    0111                     1000    1001    1010    1011                     1100    1101    1110    1111       bits          for i in range len s            bits    hex table int s i   base 16       return bits

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Assuming you have a byte string like so    x12 x45 x00 xAB   and you know the amount of bytes and their type you can also use this approach  import struct  bytes     x12 x45 x00 xAB  val   struct unpack   lt BBH   bytes    val    18  69  43776    As I specified little endian  using the   lt   char  at the start of the format string the function returned the decimal equivalent   0x12   18  0x45   69  0xAB00   43776  B is equal to one byte  8 bit  unsigned  H is equal to two bytes  16 bit  unsigned  More available characters and byte sizes can be found here  The advantages are    You can specify more than one byte and the endian of the values  Disadvantages    You really need to know the type and length of data your dealing with

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You should be able to build a string holding the binary data using something like   data    fef0babe  bits      for x in xrange 0  len data   2    bits    chr int data x x 2   16     This is probably not the fastest way  many string appends   but quite simple using only core Python

[python] hexadecimal string to byte array in python

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