python访问列表的第二个元素

你可以尝试list indexing:

data = [[6.0, 0.5], [6.1, 1.0], [6.2, 1.5], [6.3, 2.0], [6.4, 2.5], [6.5, 3.0], [6.6, 3.5], [6.7, 4.0], [6.8, 4.5]]
d1 = [item[0] for item in data]
print d1
d2 = [item[1] for item in data]
print d2

输出:

[6.0, 6.1, 6.2, 6.3, 6.4, 6.5, 6.6, 6.7, 6.8]
[0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5]