In [1]:

    

%load_ext cython


    

In [2]:

    

%%cython
cdef class B:
    cdef int i, n
    def __iter__(self):
        self.i = 0
        self.n = 10
        return self
    def __next__(self):
        self.i += 1
        if self.i > self.n:
            raise StopIteration
        else:
            return self.i


    

In [3]:

    

b = B()
for x in b:
    print(x, end='')
print('\n\nAutomatic restarts!\n')
for x in b:
    print(x, end='')


    

    




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Automatic restarts!

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