a=[1,2,3,4,5,6,7] print(a[:9]) print(a[-10:]) print(a[11:15])
输出：
[1, 2, 3, 4, 5, 6, 7]
[1, 2, 3, 4, 5, 6, 7]
[]
a=[1,2,3,4,5,6,7] print(a[:9]) print(a[-10:]) print(a[11:15])
输出：
[1, 2, 3, 4, 5, 6, 7]
[1, 2, 3, 4, 5, 6, 7]
[]
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