def fib(count):
    n,before, after = 0,0,1
    for i in range(count):
        before, after = after, before+after
        yield before#替代了print（before）

g = fib(8)
print(g)
print(g.__next__())
print(next(g))

print(next(g))
print(next(g))
print(next(g))
print(next(g))
print(next(g))

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