擅长:python、mysql、java
<p>你也许可以使用<a href="https://docs.python.org/2/library/collections.html#counter-objects" rel="nofollow">Counter</a>,因为<a href="https://docs.python.org/2/library/collections.html#counter-objects" rel="nofollow">official documentation</a>上有一些很好的例子。你知道吗</p>