#!/bin/env python3
# A simple iterator example

class Reverse:
    """Iterator for looping over sequence backwards."""
    def __init__(self, data):
        self.data = data
        self.index = len(data)
    def __iter__(self):
        return self
    def next(self):
        if self.index == 0: raise StopIteration
        self.index = self.index - 1
        return self.data[self.index]

it = Reverse(range(5))
try:
    while (True):
        x=it.next()
        print (x)
except StopIteration:
    print("Stopped with iteration.")