擅长:python、mysql、java
<p><code>random.choice</code>从非空<em>序列</em>中获取一个随机元素。如果实现<code>__getitem__</code>,<a href="https://docs.python.org/3.6/library/functions.html#iter" rel="nofollow noreferrer">python can use that to treat your object as a sequence by indexing</a>,它就是这样做的。你知道吗</p>