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Python 如何提取python中的一列

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如何提取python中的一列

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>>> arr
[[10, 11, 12, 13, 14, 15, 16, 17, 18, 19],
 [11, 12, 13, 14, 15, 16, 17, 18, 19, 20],
 [12, 13, 14, 15, 16, 17, 18, 19, 20, 21],
 [13, 14, 15, 16, 17, 18, 19, 20, 21, 22],
 [14, 15, 16, 17, 18, 19, 20, 21, 22, 23],
 [15, 16, 17, 18, 19, 20, 21, 22, 23, 24],
 [16, 17, 18, 19, 20, 21, 22, 23, 24, 25],
 [17, 18, 19, 20, 21, 22, 23, 24, 25, 26],
 [18, 19, 20, 21, 22, 23, 24, 25, 26, 27],
 [19, 20, 21, 22, 23, 24, 25, 26, 27, 28],
 [20, 21, 22, 23, 24, 25, 26, 27, 28, 29],
 [21, 22, 23, 24, 25, 26, 27, 28, 29, 30]]
>>> l = [x[0] for x in arr]
>>> l
[10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21]
>>>
处无为之事，行不言之教；作而弗始，生而弗有，为而弗恃，功成不居!

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