Scott David Daniels <[EMAIL PROTECTED]> wrote in
news:[EMAIL PROTECTED]:
> Philipp H. Mohr wrote:
>> I am trying to xor the byte representation of every char in a
>> string with its predecessor. But I don't know how to convert a
>> char into its byte representation.
> ord('a') == 97; chr(97) == 'a'; "ord" gives you the value of the
> byte.
>
>> e.g. everything between $ and * needs to be xor:
>> $GPGSV,3,1,10,06,79,187,39,30,59,098,40,25,51,287,00,05,25,
>> 103,44*
>> to get the checksum.
>
> Probably you want a byte-array here, rather than going
> char-by-char. Try:
> import array
> base = ('$GPGSV,3,1,10,06,79,187,39,30,59,098,'
> '40,25,51,287,00,05,25,103,44*')
> bytes = array.array('b', base[1 : -1])
> for i in reversed(range(len(bytes))):
> bytes[i] ^= bytes[i-1]
> result = bytes.tostring()
>
> --Scott David Daniels
> [EMAIL PROTECTED]
>
What is the byte representation of 287?
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