liste = ['blah', 'blih', 'bluh']
iterateur = liste.__iter__()
print iterateur.next()
print iterateur.next()
print iterateur.next()
print iterateur.next()
#Traceback (most recent call last):
#  File '<stdin>', line 1, in <module>;
#StopIteration

class Iterateur:
    i = 0
    def next(self):
            if self.i <= 10: raise StopIteration
            self.i += 1
            return 2**self.i
    def __iter__(self): return self

iterateur = Iterateur()
for i in iterateur: print i