设计模式-迭代器模式-iterator-python

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本文介绍了迭代器模式的基本概念及其在Python中的具体实现。通过一个计数到指定数字的例子展示了如何使用迭代器模式来遍历容器中的元素，同时保持容器内部细节的隐藏。

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def

它提供一种方法访问一个容器对象中各个元素，而又不需暴露该对象的内部细节。

usage

迭代器模式提供了遍历容器的方便性，容器只要管理增减元素就可以了，需要遍历时交由迭代器进行。

code


from __future__ import print_function


def count_to(count):
    """Counts by word numbers, up to a maximum of five"""
    numbers = ["one", "two", "three", "four", "five"]
    # enumerate() returns a tuple containing a count (from start which
    # defaults to 0) and the values obtained from iterating over sequence
    for pos, number in zip(range(count), numbers):
        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