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| Date | Sat, 03 Nov 2012 10:34:26 -0500 |
| From | Tim Chase <python.list@tim.thechases.com> |
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| Subject | Re: How to generate account number? |
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On 11/03/12 08:22, Roy Smith wrote:
> Even better might be base-32 encoding the value. Strings of
> digits have an information density of about 3.2 bits/char.
> Base-32 is just about as readable, but gives you 5 bits/char, so
> you end up with a few less characters (which you still want to
> chunk into 3 or 4 character groups).
For things that will be read off a screen/paper, I recommend
omitting several letters that are easy to mistake visually: i/I/l/1
and O/0 in particular. The VIN (vehicle identification number) on
all US cars avoids these characters[*], making it easier to read
them back without concern for "is that a zero or an oh; and is that
an ell, a one, a lowercase eye, or a capital eye?" As an encoding
advantage,
>>> print len(''.join(c for c in (string.ascii_uppercase +
string.digits) if c not in "O0iIl1"))
32
the number 32 is pretty handy when dealing with binary :-)
-tkc
[*]
The VIN avoids "Q" too and does use the digits 0/1, but the idea
holds. Make it easy to ready back.
Back to comp.lang.python | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
How to generate account number? Andriy Kornatskyy <andriy.kornatskyy@live.com> - 2012-11-03 00:13 +0300
Re: How to generate account number? GangGreene <GangGreene@example.com> - 2012-11-02 18:02 -0400
RE: How to generate account number? Andriy Kornatskyy <andriy.kornatskyy@live.com> - 2012-11-03 11:38 +0300
Re: How to generate account number? Roy Smith <roy@panix.com> - 2012-11-03 09:22 -0400
Re: How to generate account number? Tim Chase <python.list@tim.thechases.com> - 2012-11-03 10:34 -0500
RE: How to generate account number? Andriy Kornatskyy <andriy.kornatskyy@live.com> - 2012-11-03 19:18 +0300
RE: How to generate account number? Andriy Kornatskyy <andriy.kornatskyy@live.com> - 2012-11-03 19:23 +0300
Re: How to generate account number? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-11-02 22:39 +0000
RE: How to generate account number? Andriy Kornatskyy <andriy.kornatskyy@live.com> - 2012-11-03 11:42 +0300
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