Also using this example class:

In [5]: iter(Iterable('one'))
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-5-b250104a560e> in <module>()
----> 1 iter(Iterable('one'))

<ipython-input-3-0f0fff743d6c> in __iter__(self)
      3         self.n = n
      4     def __iter__(self):
----> 5         return iter(range(self.n))
      6 

TypeError: range() integer end argument expected, got str.