On Tue, 2004-12-14 at 18:18, Paul Rubin wrote:
> Markus Zeindl <[EMAIL PROTECTED]> writes:
>
> > Now I get every character with a loop:
> > <code>
> > buffer = ""
> > for i in range(len(message)):
> > ch = message[i-1:i]
>
> You mean
> ch = message[i]
> what you have does the wrong thing when i = 0.
>
> > Here is the problem. I got a string with one character and I
> > want his ascii representain, for "a" -> 97
> > but I want to calculate like iCh = iCh+3 or something else.
>
> iCh = ord(ch)
>
> > The next step is how I convert it back to an char and append it
> > to the buffer, but that' no problem.
>
> ch = chr(iCh)
for i in range( len( message )):
ch = message[ i ] # don't use message[i-1:i], yech!
Strings are also sequences in python. You might find this weird, but
...
"anystring"[0] == "anysring"[0][0][0][0][0]
is always true. Taking an element returns the character as a string of
length 1.
Think in terms of maping here. Don't say ...
for ...
Think ...
message = map( ord, message )
or
message = [chr( (ord( x ) + 3 )%256) for x in message]
Adam DePrince
--
http://mail.python.org/mailman/listinfo/python-list
