def __init__(self, options):

self.options = sorted(options)

def complete(self, text, state):

if state == 0: # on first trigger, build possible matches

if text: # cache matches (entries that start with entered text)

self.matches = [s for s in self.options

if s and s.startswith(text)]

else: # no text entered, all matches possible

self.matches = self.options[:]

# return match indexed by state

try:

return self.matches[state]

except IndexError: