Restricting the alphabet of a string

[Nathan Harmston]

Thanks,

I might just move my trinary string (if I get that far) to be encoded
as 0, 1, 2, thanks for your help.


On 30 Apr 2007 11:14:10 -0700, John Machin <sjmachin at lexicon.net> wrote:
> On Apr 30, 9:53 pm, "Nathan Harmston" <ratchetg... at googlemail.com>
> wrote:
> > Hi,
> >
> > I ve being thinking about playing around with bit strings but use in
> > some encoding problems I m considering and was trying to decide how to
> > implement a bit string class. Is there a library out there for doing
> > basic things with bit strings already is my first question?
> >
> > I know that I can extend string to bit string, but is there anyway I
> > can force the alphabet to be restricted to 1's and 0's (or even 1, 0
> > and -1, as an extension to from trinary strings).
> >
> > class Binary_String(String):
> >     pass
> >
>
> See if you can pick which line below is impractically different to the
> others:
>
> binary: 0, 1
> "trinary": -1, 0, 1
> octal: 0, 1, 2, 3, 4, 5, 6, 7
> decimal: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
>
> HTH,
> John
>
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