class Fib(object):
    def __init__(self):
        self.a,self.b = 0,1
    def __iter__(self):
        return self
    def __next__(self):
        self.a, self.b = self.b, self.a + 1
        return self.a
fib = Fib()
for n in fib:
    if fib.a<10000:
       print(n)
    else:break