On Thu, Jan 14, 2010 at 2:45 PM, nameless <xsatelli...@gmail.com> wrote: > > > I want username field is automatically filled with this value: > > username = str(n); > > where n is a number of 10 digits ( autoincremented or random ). > > . > > I tried to add this in save method: > > username = str(random.randint(1000000000,9999999999)) > > but there is a collision problem when n is the same for 2 users > ( although rare initially ). > > . > > How do I do this ? > > Thanks ^_^ >
Use a version 4 UUID instead. If you generate 1 billion version 4 UUIDs a second for 100 years, you have ~ 50% chance of a collision. They are also built in to later versions of python (2.5+): >>> import uuid >>> print uuid.uuid4() 92d6a4f4-918d-4a9b-8251-3150c88c62e7 Cheers Tom
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