pyreadline: default editable input; please, help.

[rbenit68]

I would like to run this minimal example: I get the prompt
(Question?), but not the 'default editable signal'. Please ¿any hints?
(Windows XP-SP3, Python 2.6, pyreadline 1.5)

import readline

def input_default(prompt, default):
   def startup_hook():
      readline.insert_text(default)
   readline.set_startup_hook(startup_hook)
   try:
      return raw_input(prompt)
   finally:
      readline.set_startup_hook(None)

print input_default("Question?", default="default editable answer")