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基本的python吧:
In [1]: a=[[1, 2, 3], [4, 5, 6], [7, 8, 9], [10, 11, 12]]
In [2]: print map(list,zip(*a))
[[1, 4, 7, 10], [2, 5, 8, 11], [3, 6, 9, 12]]