擅长:python、mysql、java
<p><code>[-1:0:-1]</code>意思是:从索引<code>len(string)-1</code>开始,向上移动到<code>0</code>(不包括),并采取<code>-1</code>(相反)的步骤。</p>
<p>因此,将获取以下索引:</p>
<pre><code>le-1, le-1-1, le-1-1-1 .... 1 # le is len(string)
</code></pre>
<p>示例:</p>
<pre><code>In [24]: strs = 'foobar'
In [25]: le = len(strs)
In [26]: strs[-1:0:-1] # the first -1 is equivalent to len(strs)-1
Out[26]: 'raboo'
In [27]: strs[le-1:0:-1]
Out[27]: 'raboo'
</code></pre>