Generate unique ID for URL
steve+comp.lang.python at pearwood.info
Wed Nov 14 03:04:26 CET 2012
On Tue, 13 Nov 2012 16:13:58 -0800, Miki Tebeka wrote:
>> I want to create a URL-safe unique ID for URL's. What do you recommend?
>> - Compression?
> You can use base62 with a running counter, but then you'll need a (semi)
> centralized entity to come up with the next id.
> You can see one implementation at http://bit.ly/PSJkHS (AppEngine
Perhaps this is a silly question, but if you're using a running counter,
why bother with base64? Decimal or hex digits are URL safe. If there are
no concerns about predictability, why not just use the counter directly?
You can encode a billion IDs in 8 hex digits compared to 16 base64
py> "%x" % 1000000000
Short and sweet and easy: no base64 calculation, no hash function, no
database lookup, just a trivial int to string conversion.
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