readline-autocomplete

import readline

texts = ['hello', 'world', 'readline']

def completer(text, state):
    options = [x for x in texts if x.startswith(text)]
    try:
        return options[state]
    except IndexError:
        return None

readline.set_completer(completer)
readline.parse_and_bind("tab: complete")

while 1:
    a = raw_input("> ")
    print "You entered", a