lightweight encryption of text file

[Paul Rubin]

Robert Kern <robert.kern at gmail.com> writes:
> Are you on a 64-bit platform? Unfortunately, array's integer typecodes
> are platform-specific, but p3.py requires a 32-bit integer ...

Oh yes, thanks, I never did get around to dealing with 64 bit platforms.
I also notice that some of the unit test functions use print statements,
which won't compile under Python 3.0.  I will try to release a version
in the next few days with fixes for both of these issues.