list 合并
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>>> list1 = [11,22,33]
>>> map(None,list1)
[11, 22, 33]
>>> list1 = [11,22,33]
>>> list2 = [44,55,66]
>>> list3 = [77,88,99]
>>> map(None,list1,list2,list3)
[(11, 44, 77), (22, 55, 88), (33, 66, 99)]
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