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The function set by readline.set_completer must return one completion per call. This should be great if we can return an iterable, because with current implementation I have to write a wrapper:
cache = None
def completer(text, state):
 if cache:
 if len(cache) > 0:
 return cache.pop(0)
 else:
 cache = None
 return None
 res = completer_returning_iterable(text)
 if isinstance(res, str) or res == None:
 return res
 cache = res
 return completer(text, state)
readline.set_completer(completer)
And completer_returning_list, the true completer, returns a pythonic iterable for all possible completion.