How many attempts to generate a unique ID?

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

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