[Tutor] Masking operation
srilyk at gmail.com
Thu Oct 15 04:48:38 CEST 2009
On Wed, Oct 14, 2009 at 6:31 PM, Rich Lovely <roadierich at googlemail.com>wrote:
> Specifically, cycle and izip. itertools.cycle is the trick here, izip
> is a more efficient (in this case) version of zip.
Ahah! Cycle is exactly what I wanted - I thought there was something like
this but I forgot where I found it.
Using zip is redundant for me, this is what my function looks like now:
def crypt(msg, mask):
m = itertools.cycle(mask)
word = ''
for l in msg:
word += chr(ord(l) ^ ord(m.next()))
and works quite perfectly.
Alan - I wish I had known this a few days ago when I was trying to use masks
to set debug levels. Oh well - having experimented with what I've learned in
my discrete structures class about and, or, xor, I've learned what I need to
know, and reviewing your tutorial really helps put some of the pieces
together that I wasn't able to come up with on my own.
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