andrew...@gmail.com於 2012年10月29日星期一UTC+8上午11時12分11秒寫道：
> The slice operator does not give any way (I can find!) to take slices from
> negative to positive indexes, although the range is not empty, nor the
> expected indexes out of range that I am supplying.
>
>
>
> Many programs that I write would require introducing variables and logical
> statements to correct the problem which is very lengthy and error prone
> unless there is a simple work around.
>
>
>
> I *hate* replicating code every time I need to do this!
>
>
>
> I also don't understand why slice() is not equivalent to an iterator, but can
> replace an integer in __getitem__() whereas xrange() can't.
>
>
>
>
>
> Here's an example for Linux shell, otherwise remove /bin/env...
>
> {{{#!/bin/env python
>
> a=[1,2,3,4,5,6,7,8,9,10]
>
> print a[-4:3] # I am interested in getting [7,8,9,10,1,2] but I get [].
>
> }}}
I'll suggest to use the reverse method
to get what you want.
Of course, the reverse method is not efficient for
a list of a huge number of objects in python.
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