take the following as an example, which could work well.
But my concern is, will list 'l' be deconstructed after function return? and 
then iterator point to nowhere?

def test():
    l = [1, 2, 3, 4, 5, 6, 7, 8]
    return iter(l)
def main():
    for i in test():
        print(i)
   
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