Do you need this identifier to be so short? If that's not a problem, why don't you use something tried and that's proven that will succeed: GUIDS (or UUIDs).
http://en.wikipedia.org/wiki/Globally_unique_identifier http://docs.python.org/library/uuid.html On Sun, Sep 9, 2012 at 8:10 PM, Anton Popovine <anton.popov...@gmail.com>wrote: > Hi everyone! First time posting to this group! > > I have a model Class where each row has a unique alphanumeric ID string > like 'EX39H'. > > This is the function I use to generate the code. > > def gen_class_code(): > import string > import random > size = 5 > max_size = 16 > attempts = 1000 > chars = string.ascii_uppercase + string.digits > > # lets try <attempts> times to generate unique id, else increase code > length > res = "" > while (size <= max_size): > for i in range(attempts): > temp = ''.join(random.choice(chars) for i in range(size)) > if not Class.objects.filter(code=temp).exists(): > res = temp > break > if res : break > > return res > > How much would you set the attempts variable to and why? > > Thanks in advance > Anton > > -- > You received this message because you are subscribed to the Google Groups > "Django users" group. > To view this discussion on the web visit > https://groups.google.com/d/msg/django-users/-/-JYyShU_ciUJ. > To post to this group, send email to django-users@googlegroups.com. > To unsubscribe from this group, send email to > django-users+unsubscr...@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/django-users?hl=en. > -- George R. C. Silva Desenvolvimento em GIS http://geoprocessamento.net http://blog.geoprocessamento.net -- You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-users@googlegroups.com. To unsubscribe from this group, send email to django-users+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/django-users?hl=en.
