code: def _py3_crc16(value):
      
      crc = 0
      for byte in value:
          crc = ((crc << 8) & 0xffff) ^ _CRC16_LOOKUP[((crc >> 8) ^ byte) & 0xff]
      return crc
docs: Calculate the CRC for the value in Python 3
  
      :param bytes value: The value to return for the CRC Checksum
      :rtype: int