a python script to convert arcmap labels to proper case

arcpy_proper_case.py

import re
def title(value):
    value = value.decode('utf-8')
    t = re.sub("([a-z])'([A-Z])", lambda m: m.group(0).lower(), value.title())
    return re.sub("\d([A-Z])", lambda m: m.group(0).lower(), t)

title(!NOM_MUNICI!)