Python nested spintax parser

spinner.py

#!/usr/local/env/ python
# -*- coding:utf-8 -*-

'''
This is a basic yet powerfull re function to parse any spintax text.
Works with nested curly brackets.
'''

import re, random

def spinner(s):
    
    '''
    Example of 3 level nested spintax text
    s = "hola {soy|me llamo} {{juan|juanito}|{jose|{pepe|pepelu}}}"
    '''

    while True:
        s, n = re.subn('{([^{}]*)}',
                    lambda m: random.choice(m.group(1).split("|")),
                    s)
        if n == 0: break
    return s.strip()


if __name__ == "__main__":
   s = "hola {soy|me llamo} {{juan|juanito}|{jose|pepe}}"
   for i in range(0,2):
       print(spinner(s))