Generating random string encoded in base32 with Python

16-base32.py

import base64
import random

def generate_16char_base32(pre):
  """
  Encode a string of 16 length in base32
  with a given string - maximum length of 10 chars -
  Note: 10 char = 16 char string in base32
  
  Warning: Decoding is not a part of this example
  since it adds a random integer to the end of string
  """
  prefix = unicode(pre)
  prefix_len = len(prefix)
  if prefix_len > 10:
    return None
  remaining = 10 - prefix_len
  random_int_str = ''
  if remaining != 0:
          random_from = 10 ** (remaining-1)
          random_to = (10 ** remaining) - 1
          random_int = random.randint(random_from, random_to)
          random_int_str = unicode(random_int)
  str_to_encode = prefix + random_int_str
  encoded_str = base64.b32encode(str_to_encode)
  return encoded_str