google app engine - Generating short, random and unique string on Appengine -

google app engine - Generating short, random and unique string on Appengine -

i want generate string ids have next properties:

short, 5-6 apha + numbers random unique, desired, not of import first too

currently thinking about:

allocate unique id https://developers.google.com/appengine/docs/python/datastore/functions#allocate_ids hash secret key, md5(id + secret) take first 5 symbols

is there improve way? thought using datacenter_id + instance_id + request_id , have no thought if better.

why not generate random string using random.choise?

for _ in xrange(5): yield random.choice(digits + alpha)

this has space of 36^5 keys

google-app-engine random