indicate_last.py

# -*- coding: utf-8 -*-
from __future__ import division, absolute_import, print_function, unicode_literals

def indicate_last(gen):
    saved_e = None
    prev_value = next(gen)
    value = None
    while True:
        if saved_e is not None:
            raise saved_e
        try:
            value = next(gen)
        except StopIteration as e:
            saved_e = e
        yield prev_value, (saved_e is not None)
        prev_value = value
        value = None

for v, b in indicate_last(i for i in range(5)):
    print(v, b)