class Fabs(object):

    def __init__(self,max):

        self.max = max

        self.n, self.a, self.b = 0,0,1

    def __iter__(self):

        return self

    def next(self):

        if self.n < self.max:

            r = self.b

            self.a,self.b = self.b, self.a+self.b

            self.n = self.n+1

            return r

        raise StopIteration()

for key in Fabs(3):

    print (key)