update from Atlas

14-it-generator/sentence_iter2.py

@@ -0,0 +1,37 @@
+"""
+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('\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