Iterators Tutorial

Python/Iterators-Coding-Problem/iter-demo.py

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+
+class Sentence:
+
+    def __init__(self, sentence):
+        self.sentence = sentence
+        self.index = 0
+        self.words = self.sentence.split()
+
+    def __iter__(self):
+        return self
+
+    def __next__(self):
+        if self.index >= len(self.words):
+            raise StopIteration
+        index = self.index
+        self.index += 1
+        return self.words[index]
+
+
+def sentence(sentence):
+    for word in sentence.split():
+        yield word
+
+
+my_sentence = sentence('This is a test')
+
+# for word in my_sentence:
+#     print(word)
+
+print(next(my_sentence))
+print(next(my_sentence))
+print(next(my_sentence))
+print(next(my_sentence))
+print(next(my_sentence))
+
+
+# This should have the following output:
+# This
+# is
+# a
+# test

Python/Iterators/iter-demo.py

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+
+class MyRange:
+
+    def __init__(self, start, end):
+        self.value = start
+        self.end = end
+
+    def __iter__(self):
+        return self
+
+    def __next__(self):
+        if self.value >= self.end:
+            raise StopIteration
+        current = self.value
+        self.value += 1
+        return current
+
+
+def my_range(start):
+    current = start
+    while True:
+        yield current
+        current += 1
+
+
+nums = my_range(1)
+
+for num in nums:
+    print(num)