了解切片符号 - Understanding slice notation

问题：

I need a good explanation (references are a plus) on Python's slice notation. 我须要一个关于Python切片符号的很好的解释（引用是一个加号）。

To me, this notation needs a bit of picking up. 对我而言，此表示法须要一些注意。

It looks extremely powerful, but I haven't quite got my head around it. 它看起来很是强大，可是我尚未彻底了解它。

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解决方案：

参考一： https://stackoom.com/question/28T5/了解切片符号
参考二： https://oldbug.net/q/28T5/Understanding-slice-notation