擅长:python、mysql、java
<p>使用<a href="http://docs.python.org/library/collections.html#counter-objects" rel="nofollow noreferrer">^{<cd1>}</a>:</p>
<pre><code>>>> from collections import Counter
>>> Counter('ATCGACAG')
Counter({'A': 3, 'C': 2, 'G': 2, 'T': 1})
>>> Counter('ACCGACG')
Counter({'C': 3, 'A': 2, 'G': 2})
</code></pre>