擅长:python、mysql、java
<p>你可以用一个简单的<a href="https://docs.python.org/2/library/collections.html#collections.Counter" rel="nofollow noreferrer">Counter</a>来实现</p>
<pre><code>from collections import Counter
Counter("management")
</code></pre>
<pre><code>Counter({'a': 2, 'e': 2, 'm': 2, 'n': 2, 'g': 1, 't': 1})
</code></pre>