擅长:python、mysql、java
<pre><code>def swap_first_and_last(some_list):
some_list[0], some_list[-1] = some_list[-1], some_list[0]
</code></pre>
<p>工作原理如下</p>
<pre><code>>>> L1
[1, 2, 3]
>>> swap_first_and_last(L1)
>>> L1
[3, 2, 1]
>>>
</code></pre>