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"""

Implementation of the iterator pattern using the iterator protocol from Python

*TL;DR

Traverses a container and accesses the container's elements.

"""

class NumberWords:

"""Counts by word numbers, up to a maximum of five"""

_WORD_MAP = (

'one',

'two',

'three',

'four',

'five',

)

def __init__(self, start, stop):

self.start = start

self.stop = stop

def __iter__(self): # this makes the class an Iterable

return self

def __next__(self): # this makes the class an Iterator

if self.start > self.stop or self.start > len(self._WORD_MAP):

raise StopIteration

current = self.start

self.start += 1

return self._WORD_MAP[current - 1]

# Test the iterator

def main():

"""

# Counting to two...

>>> for number in NumberWords(start=1, stop=2):

... print(number)

one

two

# Counting to five...

>>> for number in NumberWords(start=1, stop=5):

... print(number)

one

two

three

four

five

"""

if __name__ == "__main__":

import doctest

doctest.testmod()