使用列表列表时，列表理解是您的朋友：
In [111]: alist
Out[111]:
[[0, 1, 2, 3, 4, 5],
[6, 7, 8, 9, 10, 11],
[12, 13, 14, 15, 16, 17],
[18, 19, 20, 21, 22, 23]]
In [112]: [row[1] for row in alist]
Out[112]: [1, 7, 13, 19]
还有一个方便的“成语”用于转换嵌套列表，将“列”转换为“行”：
In [113]: tlist = list(zip(*alist))
In [114]: tlist
Out[114]:
[(0, 6, 12, 18),
(1, 7, 13, 19),
(2, 8, 14, 20),
(3, 9, 15, 21),
(4, 10, 16, 22),
(5, 11, 17, 23)]
In [115]: tlist[1]
Out[115]: (1, 7, 13, 19)
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