为什么-1不从最后一个开始
>>> L=range(1,11)
>>> print L
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
>>> print L[-1]
10
>>> print L[-11:-1]
[1, 2, 3, 4, 5, 6, 7, 8, 9]
>>> print L[-11:]
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
>>>
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>>> L=range(1,11)
>>> print L
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
>>> print L[-1]
10
>>> print L[-11:-1]
[1, 2, 3, 4, 5, 6, 7, 8, 9]
>>> print L[-11:]
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
>>>
2015-12-06
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