"""

Sentence: iterate over words using the Iterator Pattern, take #2

WARNING: the Iterator Pattern is much simpler in idiomatic Python;

see: sentence_gen*.py.

"""

import re

import reprlib

RE_WORD = re.compile(r'\w+')

class Sentence:

def __init__(self, text):

self.text = text

def __repr__(self):

return 'Sentence(%s)' % reprlib.repr(self.text)

def __iter__(self):

word_iter = RE_WORD.finditer(self.text) # <1>

return SentenceIter(word_iter) # <2>

class SentenceIter():

def __init__(self, word_iter):

self.word_iter = word_iter # <3>

def __next__(self):

match = next(self.word_iter) # <4>

return match.group() # <5>

def __iter__(self):

return self