[Tutor] Simple ROT-13 Script

[Matthew Hoffman]

Hello all! I have been reading this list for a goodly amount of time and 
have never felt worthy to submit a question until now.

I just wrote a quick one-off script and I would like your opinions on any 
Python-isms. It's just a ROT-13 script (I got a Neal Stephenson book for 
xmas). I would just like to entertain your thoughts about what I could have 
done better, etc. Cheers! ~Matt

#! /usr/bin/python

encrypt = lambda s: chr(ord(s) + 13)
decrypt = lambda s: chr(ord(s) - 13)

s = 'guido'
r = map(encrypt, s)
t = map(decrypt, r)

>>>r
['t', '\x82', 'v', 'q', '|']
>>>t
['g', 'u', 'i', 'd', 'o']

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