code: def bytes_to_int(byte_array, big_endian=True, signed=False):
      
      if six.PY3:
          order = 'little'
          if big_endian:
              order = 'big'
          return int.from_bytes(byte_array, byteorder=order, signed=signed)
      else:
          length = len(byte_array)
          if length == 1:
              code = 'B'
          elif length == 2:
              code = 'H'
          elif length == 4:
              code = 'L'
          elif length == 8:
              code = 'Q'
          else:
              raise Exception("bytes_to_int : length of byte_array should be 1, 2, 4, or 8")
          if big_endian:
              code = '>'+code
          else:
              code = '<'+code
  
          if signed:
              code = code.lower()
          return struct.unpack(code, byte_array)[0]
docs: Converts a byte array to an integer.