Byte Array to Hex String

Question

I have data stored in a byte array  How can I convert this data into a hex string   Example of my byte array   array alpha     133  53  234  241

User · Answer

If you have a numpy array  you can do the following    gt  gt  gt  import numpy as np  gt  gt  gt  a   np array  133  53  234  241    gt  gt  gt  a astype np uint8  data hex    8535eaf1

User · Answer

Consider the hex   method of the bytes type on Python 3 5 and up    gt  gt  gt  array alpha     133  53  234  241    gt  gt  gt  print bytes array alpha  hex    8535eaf1   EDIT  it s also much faster than hexlify  modified  falsetru s benchmarks above   from timeit import timeit N   10000 print  bytearray   hexlify - gt    timeit       binascii hexlify data  decode  ascii         setup  import binascii  data   bytearray range 255         number N     print  byte   hex          - gt    timeit       data hex         setup  data   bytes range 255         number N       Result   bytearray   hexlify - gt  0 011218150997592602 byte   hex          - gt  0 005952142993919551

User · Answer

hex string      join   02x    b for b in array alpha

User · Answer

Using str format    gt  gt  gt  array alpha     133  53  234  241    gt  gt  gt  print    join    02x   format x  for x in array alpha  8535eaf1   or using format   gt  gt  gt  print    join format x   02x   for x in array alpha  8535eaf1      Note  In the format statements  the 02 means it will pad with up to 2 leading 0s if necessary  This is important since  0x1  0x1  0x1  i e   0x010101  would be formatted to  111  instead of  010101     or using bytearray with binascii hexlify    gt  gt  gt  import binascii  gt  gt  gt  binascii hexlify bytearray array alpha    8535eaf1      Here is a benchmark of above methods in Python 3 6 1   from timeit import timeit import binascii  number   10000  def using str format   - gt  str      return    join    02x   format x  for x in test obj   def using format   - gt  str      return    join format x   02x   for x in test obj   def using hexlify   - gt  str      return binascii hexlify bytearray test obj   decode  ascii    def do test        print  Testing with   -byte      format len test obj   test obj   class     name         if using str format      using format      using hexlify            raise RuntimeError  Results are not the same        print  Using str format       - gt      str timeit using str format  number number        print  Using format           - gt      str timeit using format  number number        print  Using binascii hexlify - gt      str timeit using hexlify  number number     test obj   bytes  i for i in range 255    do test    test obj   bytearray  i for i in range 255    do test     Result   Testing with 255-byte bytes  Using str format       - gt  1 459474583090427 Using format           - gt  1 5809937679100738 Using binascii hexlify - gt  0 014521426401399307 Testing with 255-byte bytearray  Using str format       - gt  1 443447684109402 Using format           - gt  1 5608712609513171 Using binascii hexlify - gt  0 014114164661833684   Methods using format do provide additional formatting options  as example separating numbers with spaces     join  commas      join  upper-case printing    02X   format x  format x   02X    etc   but at a cost of great performance impact

User · Answer

Or  if you are a fan of functional programming    gt  gt  gt  a    133  53  234  241   gt  gt  gt     join map lambda b  format b   02x    a   8535eaf1  gt  gt  gt

[python] Byte Array to Hex String

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