new_contents: #!/usr/bin/env python
  import alphatwirl
  import unittest
  
  ##____________________________________________________________________________||
  def genFunc():
      yield 101
      yield 102
      yield 103
  
  ##____________________________________________________________________________||
  class IteClass(object):
      def __init__(self):
          self.val = 100
          pass 
  
      def __iter__(self):
          self.val = 101
          yield self
          self.val = 102
          yield self
          self.val = 103
          yield self
  
  ##____________________________________________________________________________||
  class TestExampleGeneratorFunction(unittest.TestCase):
  
      def test_genFunc_Iteration(self):
          self.assertEqual([101, 102, 103], [e for e in genFunc()])
  
      def test_genFunc_ManualIteration(self):
          gen = genFunc()
          it = iter(gen)
          self.assertIs(it, gen)
          self.assertEqual(101, next(it))
          self.assertEqual(102, next(it))
          self.assertEqual(103, next(it))
          self.assertRaises(StopIteration, next, it)
  
  ##____________________________________________________________________________||
  class TestExampleIterableObject(unittest.TestCase):
  
      def test_iteObj_Iteration(self):
          self.assertEqual([101, 102, 103], [i.val for i in IteClass()])
  
      def test_iteObj_ManualIteration(self):
          itObj = IteClass()
          self.assertEqual(100, itObj.val)
          it = iter(itObj)
          itObj1 = next(it)
          self.assertIs(itObj, itObj1)
          self.assertEqual(101, itObj1.val)
          itObj2 = next(it)
          self.assertIs(itObj, itObj2)
          self.assertEqual(102, itObj2.val)
          itObj3 = next(it)
          self.assertIs(itObj, itObj3)
          self.assertEqual(103, itObj3.val)
          self.assertRaises(StopIteration, next, it)
  
  
  ##____________________________________________________________________________||
  
subject: add test_iterator_example.py