擅长:python、mysql、java
<p>可以使用Python的扩展切片功能定期访问列表:</p>
<pre><code>>>> a = range(10)
>>> # Pick every other element in a starting from a[1]
>>> b = a[1::2]
>>> print b
>>> [1, 3, 5, 7, 9]
</code></pre>
<p>负索引工作正常:</p>
<pre><code>>>> c = a[-1::-2]
>>> print c
>>> [9, 7, 5, 3, 1]
</code></pre>
<p>为了你的案子</p>
<pre><code>>>> a, b = s.partition('-')[::2]
</code></pre>