python-patterns/iterator.py at master · ahand520/python-patterns

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#!/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"""

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

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