遍历嵌套列表

Question

How do i create a function to iterate my list in this manner. Seems simply but im stuck...

    myList= [[1,2,3], [4,5,6], [7,8,9]]

    def name(myList):
        somework..

    newList = [[1,4,7]. [ 2,5,8], [3,6,9]]

Answer 1

In [3]: zip(*myList)
Out[3]: [(1, 4, 7), (2, 5, 8), (3, 6, 9)]

if you specifically want list

In [4]: [list(x) for x in zip(*myList)]
Out[4]: [[1, 4, 7], [2, 5, 8], [3, 6, 9]]

for more details on zip function look at this

Answer 2

zip is what you want + argument unpacking. It's awesome. I like to think of it as python's builtin transpose.

newList = zip(*myList)

This will actually give you an iterable (python3.x) or list (python2.x) of tuple , but that's good enough for most purposes.