Python版
https://github.com/faif/python-patterns/blob/master/behavioral/iterator.py
#!/usr/bin/env python
# -*- coding: utf-8 -*-"""
http://ginstrom.com/scribbles/2007/10/08/design-patterns-python-style/
Implementation of the iterator pattern with a generator*TL;DR80
Traverses a container and accesses the container's elements.
"""from __future__ import print_functiondef count_to(count):
"""Counts by word numbers, up to a maximum of five"""
numbers = ["one", "two", "three", "four", "five"]
for number in numbers[:count]:
yield number# Test the generator
count_to_two = lambda: count_to(2)
count_to_five = lambda: count_to(5)print('Counting to two...')
for number in count_to_two():
print(number, end=' ')print()print('Counting to five...')
for number in count_to_five():
print(number, end=' ')print()### OUTPUT ###
# Counting to two...
# one two
# Counting to five...
# one two three four five
Python转载版