validate_code.py

   1 class InvalidCodeException(Exception):
   2     pass
   3
   4
   5 def validate_code(code):
   6     if len(code) < 32:
   7         raise InvalidCodeException
   8
   9     if len(code) > 32:
  10         raise InvalidCodeException
  11
  12     # check 8-bit device address
  13     # following 8-bits have to be a logical inverse of the device address
  14     for i in range(0, 8):
  15         if code[i] == code[i + 8]:
  16             raise InvalidCodeException
  17
  18     # check 8-bit command
  19     # following 8-bits have to be a logical inverse of the command
  20     for i in range(16, 24):
  21         if code[i] == code[i + 8]:
  22             raise InvalidCodeException