[Tutor] Masking operation

[Kent Johnson]

On Wed, Oct 14, 2009 at 10:48 PM, Wayne <srilyk at gmail.com> wrote:

> 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()))
>     return word

With zip() and a generator expression you can write it as
def crypt(msg, mask):
  mask = itertools.cycle(mask)
  chars = zip(msg, mask)
  return ''.join(chr(ord(l) ^ ord(m)) for l, m in chars)

which could be reduced to a one-liner if you like.

Kent