new_contents: def buffers_xor(buffer1, buffer2):
      """buffer1, buffer2: byte-like objects."""
      try:
          return bytes(b1 ^ b2 for b1, b2 in zip(buffer1, buffer2))
      except TypeError:
          print("Function 'buffers_xor' takes byte-like"
                "objects as an arguments.")
  
  
  if __name__ == '__main__':
      print(buffers_xor(bytes.fromhex('1c0111001f010100061a024b53535009181c'),
                        bytes.fromhex('686974207468652062756c6c277320657965')))
      print(bytes.fromhex('746865206b696420646f6e277420706c6179'))
  
subject: Set 1 / Challenge 2 done.