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iterator object




class Squares:
    def __init__(self, start, stop):
        self.value = start - 1
        self.stop  = stop
    def __iter__(self):                   # get iterator object
        return self
    def next(self):                       # on each for iteration
        if self.value == self.stop:
            raise StopIteration
        self.value += 1
        return self.value ** 2

for i in Squares(1,5):
     print i,

X = Squares(1,5)


X = Squares(1,5)
print [n for n in X]                     # exhausts items

print [n for n in X]                     # now it's empty

print [n for n in Squares(1,5)]

print list(Squares(1,3))

           
       
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