class IterableStack:
    def __init__(self):
        self._lst = [1, 2, 3, 4, 5]

    def __iter__(self):
        return ReverseIterator(self._lst)


class ReverseIterator:
    def __init__(self, _lst):
        self._lst = _lst
        self.position = len(_lst)

    def __next__(self):
        self.position -= 1
        if self.position < 0:
            raise StopIteration()

        return self._lst[self.position]


# container = IterableStack()
# for v in container:
#     print(v)

container = IterableStack()
it_container = iter(container)  # container.__iter__()
while True:
    try:
        v = next(it_container)  # it_container.__next__()

        # тело фора
        print(v)
        # конец тела фора
    except StopIteration:
        break