擅长:python、mysql、java
<p>看起来您想要的是<a href="http://docs.python.org/2/library/collections.html#collections.defaultdict" rel="nofollow">collections.defaultdict</a>,或者是python2.7及更高版本的<a href="http://docs.python.org/2/library/collections.html#collections.Counter" rel="nofollow">collections.Counter</a>。在</p>