Add iterator behavior to your classes : Iterator Behavior : Buildin Function PYTHON examples

Add iterator behavior to your classes

#Define a __iter__() method which returns an  #object with a next() method. If the class defines next(), then __iter__() can just  #return self: class Reverse:     "Iterator for looping over a sequence backwards"     def __init__(self, data):         self.data = data         self.index = len(data)     def __iter__(self):         return self     def next(self):         if self.index == 0:             raise StopIteration         self.index = self.index - 1         return self.data[self.index] for char in Reverse('spam'):      print char

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