方法肯定有好多种，目前用的觉得还不错的是下面这种
import itertools
iter1
= iter([1,2,3])
iter2
= iter([4,5,6])
iter3
= itertools
.chain
(iter1
, iter2
)
赞： https://stackoverflow.com/questions/571850/adding-elements-to-python-generators https://stackoverflow.com/questions/1264319/need-to-add-an-element-at-the-start-of-an-iterator-in-python
